Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Common Stock (Details Textual)

v3.10.0.1
Note 8 - Common Stock (Details Textual)
3 Months Ended 9 Months Ended 11 Months Ended
Jun. 08, 2018
USD ($)
$ / shares
shares
Feb. 12, 2018
USD ($)
$ / shares
shares
Nov. 08, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
May 22, 2017
USD ($)
yr
$ / shares
shares
Jun. 20, 2016
USD ($)
$ / shares
shares
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares 100,000                    
Shares Issued, Price Per Share | $ / shares $ 2.56                    
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 256,000                    
Proceeds from Issuance of Common Stock           $ 33,407,000 $ 31,440,000        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares       642,622   642,622   642,622      
Amortization of Debt Discount (Premium)         $ 0            
Debt Instrument, Unamortized Discount, Total       $ 1,305,000   $ 1,305,000   $ 1,305,000      
Class of Warrants or Rights, Exercises in Period | shares       0 0 0 0        
Class of Warrant or Right Number of Securities Called by Warrants or Rights Cancelled In Period | shares       0 0 0 0        
Allocated Share-based Compensation Expense, Total       $ 765,000 $ 487,000 $ 2,294,000 $ 1,314,000        
The 2016 Loan Agreement [Member]                      
Debt Issuance Costs, Net, Total                     $ 90,000
Amortization of Debt Discount (Premium)             371,000        
The 2017 Loan Agreement [Member]                      
Debt Issuance Costs, Net, Total                 $ 786,000    
Amortization of Debt Discount (Premium)       $ 82,000 68,000 $ 242,000 106,000        
Debt Instrument, Unamortized Discount, Total         1,305,000   1,305,000        
June 2016 Issuance Related to 2016 Loan Agreement [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares       100,402   100,402   100,402     100,402
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 4.98   $ 4.98   $ 4.98     $ 4.98
Warrants and Rights Outstanding                     $ 350,000
May 2017 Issuance Related to 2017 Loan Agreement [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares       222,049   222,049   222,049   222,049  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 9.50   $ 9.50   $ 9.50   $ 9.50  
Warrants and Rights Outstanding                   $ 940,000  
Warrants and Rights Outstanding, Term                   10 years  
Allocated Share-based Compensation Expense, Total       $ 0 $ 0 $ 0 $ 0        
May 2017 Issuance Related to 2017 Loan Agreement [Member] | Measurement Input, Expected Dividend Rate [Member]                      
Warrants and Rights Outstanding, Measurement Input                   0  
May 2017 Issuance Related to 2017 Loan Agreement [Member] | Measurement Input, Price Volatility [Member]                      
Warrants and Rights Outstanding, Measurement Input                   0.551  
May 2017 Issuance Related to 2017 Loan Agreement [Member] | Measurement Input, Risk Free Interest Rate [Member]                      
Warrants and Rights Outstanding, Measurement Input                   0.0225  
May 2017 Issuance Related to 2017 Loan Agreement [Member] | Measurement Input, Expected Term [Member]                      
Warrants and Rights Outstanding, Measurement Input | yr                   10  
February 2018 Offering [Member]                      
Stock Issued During Period, Shares, New Issues | shares   11,500,000                  
Share Price | $ / shares   $ 3                  
Proceeds from Issuance of Common Stock   $ 34,500,000                  
Proceeds From Issuance of Common Stock, Net   $ 32,213,000                  
November 2017 ATM Facility [Member]                      
Stock Issued During Period, Shares, New Issues | shares       3,720   277,249   336,498      
Proceeds From Issuance of Common Stock, Net       $ 10,100   $ 1,194,000   $ 1,318,000      
Aggregate Offering Price     $ 25,000,000