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 12 Months Ended
Jun. 20, 2016
Jun. 17, 2016
May 31, 2016
Apr. 30, 2016
May 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Sep. 30, 2014
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   $ 13,857,000                  
September 2014 Issuance Related to 2014 Loan Agreement [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           58,962   58,962     58,962
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 4.24   $ 4.24     $ 4.24
Amortization of Debt Discount (Premium)           $ 342,000 $ 55,000 $ 387,000 $ 102,000    
Warrant Term         10 years            
May 2015 Issuance Related to 2014 Loan Agreement [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         3,125 3,125   3,125      
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 2.96 $ 2.96   $ 2.96      
Amortization of Debt Discount (Premium)             8,000   8,000    
Distributor Warrants, March 2016 Issuance [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       25,000   25,000   25,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 6.08   $ 6.08   $ 6.08      
Warrant Term       10 years              
Fair Value Assumptions, Expected Dividend Rate       0.00%              
Fair Value Assumptions, Expected Volatility Rate       72.10%              
Fair Value Assumptions, Risk Free Interest Rate       1.78%              
Allocated Share-based Compensation Expense           $ 20,000 118,000 $ 162,000 380,000    
Contractor Warrants, May 2016 Issuance [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     5,000     5,000   5,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 7.74     $ 7.74   $ 7.74      
Warrant Term     5 years                
Fair Value Assumptions, Expected Dividend Rate     0.00%                
Fair Value Assumptions, Expected Volatility Rate     61.60%                
Fair Value Assumptions, Risk Free Interest Rate     1.20%                
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      
Warrant Term 10 years                    
Fair Value Assumptions, Expected Dividend Rate 0.00%                    
Fair Value Assumptions, Expected Volatility Rate 63.00%                    
Fair Value Assumptions, Risk Free Interest Rate 1.67%                    
Warrants and Rights Outstanding $ 350,000         $ 440,000   $ 440,000      
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               1,094   5,157  
The 2016 Loan Agreement [Member]                      
Debt Issuance Costs, Net           $ 90,000   $ 90,000      
Proceeds from Issuance of Common Stock               $ 13,857,000 11,040,000    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           506,379   506,379      
Class of Warrant or Right, Exercise Price of Warrants or Rights                  
Class of Warrants or Rights, Exercises in Period               6,250   735  
Allocated Share-based Compensation Expense           $ 202,000 $ 48,000 $ 390,000 $ 90,000