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Note 2 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Restricted Stock [Member] | 2014 Long-Term Stock Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 75,000   75,000    
Restricted Stock [Member] | Maximum [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 year
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     0 0  
Allocated Share-based Compensation Expense $ 44,000 $ 15,000 $ 61,000 $ 30,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         $ 61,000
Stock Options without Performance-based Vesting Condition [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     20,000 0  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 0.67    
Allocated Share-based Compensation Expense $ 13,000 36,000 $ 45,000 $ 91,000  
Stock Options with Performance-based Vesting Condition [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     197,000 116,000  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 0.75 $ 5.75  
Allocated Share-based Compensation Expense   $ 67,000 $ 113,000 $ 120,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 696,092   696,092    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 24,828 45,000 24,828 45,000  
Reduction in Share-based Compensation Expense $ 2,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     217,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 0.74    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,489,928   1,489,928   1,782,749
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     6 years 94 days 6 years 346 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 755,092   755,092   1,166,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term     8 years 219 days   8 years 109 days