Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Common Stock (Details Textual)

v3.7.0.1
Note 7 - Common Stock (Details Textual) - USD ($)
3 Months Ended
Mar. 22, 2017
Jun. 17, 2016
Mar. 31, 2017
Mar. 31, 2016
Jun. 20, 2016
Proceeds from Issuance of Common Stock     $ 31,503,000  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     425,274    
Class of Warrants or Rights, Exercises in Period     0 6,250  
Allocated Share-based Compensation Expense     $ 372,000 $ 188,000  
The 2016 Loan Agreement [Member]          
Debt Issuance Costs, Net     $ 90,000    
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
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 4.98   $ 4.98
Warrants and Rights Outstanding         $ 350,000
Amortization of Debt Discount (Premium)     $ 35,000 $ 0  
Unamortized Debt Issuance Expense     $ 336,000    
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  
Distributor Warrants, March 2016 Issuance [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     25,000    
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 6.08    
Allocated Share-based Compensation Expense     $ 0 $ 142,000  
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 $ 31,503,000        
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