Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Common Stock (Details Textual)

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Note 7 - Common Stock (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2017
May 22, 2017
Mar. 22, 2017
Jun. 20, 2016
Jun. 17, 2016
May 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2014
Proceeds from Issuance of Common Stock                 $ 31,440,000 $ 13,857,000  
Debt Instrument, Unamortized Discount             $ 1,688,000   $ 1,688,000    
Class of Warrants or Rights, Exercises in Period                 4,701 6,250  
Allocated Share-based Compensation Expense             $ 455,000 $ 202,000 $ 827,000 $ 390,000  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights             642,622   642,622    
The 2016 Loan Agreement [Member]                      
Debt Issuance Costs, Net             $ 90,000   $ 90,000    
Amortization of Debt Discount (Premium)             336,000 0 371,000 0  
The 2017 Loan Agreement [Member]                      
Debt Instrument, Unamortized Discount             1,688,000   1,688,000    
Debt Issuance Costs, Net $ 786,000         $ 786,000          
Amortization of Debt Discount (Premium)             38,000   38,000    
September 2014 Issuance Related to 2014 Loan Agreement [Member]                      
Amortization of Debt Discount (Premium)               342,000   387,000  
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
June 2016 Issuance Related to 2016 Loan Agreement [Member]                      
Unamortized Debt Issuance Expense             $ 0   $ 0    
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    
Warrant Term       10 years              
Warrants and Rights Outstanding       $ 350,000              
May 2017 Issuance Related to 2017 Loan Agreement [Member]                      
Allocated Share-based Compensation Expense             $ 0 $ 20,000 $ 0 $ 118,000  
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    
Warrant Term   10 years       10 years          
Warrants and Rights Outstanding $ 940,000         $ 940,000          
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                    
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]                      
Proceeds From Issuance of Common Stock, Net     $ 31,440,000                
Stock Issued During Period, Shares, New Issues     8,625,000                
Share Price     $ 4                
Proceeds from Issuance of Common Stock     $ 34,500,000                
June 2016 Offering [Member]                      
Proceeds From Issuance of Common Stock, Net         $ 13,886,000            
Stock Issued During Period, Shares, New Issues         3,105,000            
Share Price         $ 5            
Proceeds from Issuance of Common Stock         $ 15,525,000            
Restricted Stock [Member]                      
Shares Issued, Price Per Share $ 7.42         $ 7.42          
Stock Issued During Period, Value, New Issues           $ 260,000          
Stock Issued During Period, Shares, New Issues           35,000