Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Common Stock (Details Textual)

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Note 8 - Common Stock (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2017
May 22, 2017
Mar. 22, 2017
Jun. 20, 2016
Jun. 17, 2016
May 31, 2017
May 19, 2017
Aug. 30, 2016
Jul. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
May 31, 2015
Sep. 30, 2014
Proceeds from Issuance of Common Stock                       $ 31,440,000 $ 13,886,000    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                   642,622   642,622      
Debt Instrument, Unamortized Discount                   $ 1,620,000   $ 1,620,000      
Class of Warrants or Rights, Exercises in Period                       4,701 25,268    
Allocated Share-based Compensation Expense                   487,000 $ 272,000 $ 1,314,000 $ 662,000    
The 2016 Loan Agreement [Member]                              
Amortization of Debt Discount (Premium)                   0 35,000 371,000 35,000    
Debt Issuance Costs, Net       $ 90,000                      
Debt Instrument, Unamortized Discount                   0   0      
The 2017 Loan Agreement [Member]                              
Amortization of Debt Discount (Premium)                   68,000   106,000      
Debt Issuance Costs, Net $ 786,000         $ 786,000                  
Debt Instrument, Unamortized Discount                   $ 1,620,000   $ 1,620,000      
September 2014 Issuance Related to 2014 Loan Agreement [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                             58,962
Class of Warrant or Right, Exercise Price of Warrants or Rights                             $ 4.24
Amortization of Debt Discount (Premium)                     0   387,000    
Stock Issued During Period, Shares, Exercise of Warrants               17,295              
May 2015 Issuance Related to 2014 Loan Agreement [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                           3,125  
Class of Warrant or Right, Exercise Price of Warrants or Rights                           $ 2.96  
Stock Issued During Period, Shares, Exercise of Warrants                 885            
June 2016 Issuance Related to 2016 Loan Agreement [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       100,402           100,402   100,402      
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 4.98           $ 4.98   $ 4.98      
Warrants and Rights Outstanding       $ 350,000                      
Warrant Term       10 years                      
May 2017 Issuance Related to 2017 Loan Agreement [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 222,049 222,049       222,049       222,049   222,049      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 9.50 $ 9.50       $ 9.50       $ 9.50   $ 9.50      
Warrants and Rights Outstanding $ 940,000         $ 940,000                  
Warrant Term   10 years       10 years                  
Fair Value Assumptions, Expected Dividend Rate           0.00%                  
Fair Value Assumptions, Expected Volatility Rate           55.10%                  
Fair Value Assumptions, Risk Free Interest Rate           2.25%                  
Fair Value Assumptions, Expected Term 10 years                            
Allocated Share-based Compensation Expense                   $ 0 $ 0 $ 162,000 $ 9    
Vendors and Contractors Warrants, October and November 2014 Issuance [Member]                              
Class of Warrant or Right Number of Securities Called by Warrants or Rights Cancelled In Period                       0 1,094    
March 2017 Offering [Member]                              
Stock Issued During Period, Shares, New Issues     8,625,000                        
Share Price     $ 4                        
Proceeds from Issuance of Common Stock     $ 34,500,000                        
Proceeds From Issuance of Common Stock, Net     $ 31,440,000                        
June 2016 Offering [Member]                              
Stock Issued During Period, Shares, New Issues         3,105,000                    
Share Price         $ 5                    
Proceeds from Issuance of Common Stock         $ 15,525,000                    
Proceeds From Issuance of Common Stock, Net         $ 13,886,000                    
Restricted Stock [Member]                              
Stock Issued During Period, Shares, New Issues             35,000                
Shares Issued, Price Per Share             $ 7.42                
Stock Issued During Period, Value, New Issues             $ 260,000