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Note 5 - Share-based Compensation (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Note 5 - Share-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,815,000    
Allocated Share-based Compensation Expense (in Dollars) $ 154,000 $ 114,000 $ 114,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0   0
Restricted Stock [Member]      
Note 5 - Share-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 58,084    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options (in Dollars) $ 1,500,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 259 days    
Restricted Stock [Member] | Director [Member]      
Note 5 - Share-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 5,884    
Restricted Stock [Member] | Employee [Member]      
Note 5 - Share-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 52,200    
Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member]      
Note 5 - Share-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member]      
Note 5 - Share-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche Three [Member]      
Note 5 - Share-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years