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Note 6 - Stock Option Plan (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 17, 2015
May. 20, 2009
Jun. 30, 2015
Jun. 30, 2015
2009 Equity Incentive Plan [Member]        
Note 6 - Stock Option Plan (Details) [Line Items]        
Maximum Fair Value of First Exercisable Stock Incentive Options   100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0
2009 Equity Incentive Plan [Member] | Common Stock [Member]        
Note 6 - Stock Option Plan (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   223,000    
Restricted Stock [Member]        
Note 6 - Stock Option Plan (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       19,500
Allocated Share-based Compensation Expense     $ 21,000 $ 38,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       $ 13,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options     $ 415,000 $ 415,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       5 years
Restricted Stock [Member] | Officers,Directors and Key Employees [Member]        
Note 6 - Stock Option Plan (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 19,500      
Share Price $ 24.50      
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 478,000      
Restricted Stock [Member] | Vesting Each Year On July 1 Beginning July 1, 2016 [Member] | Officers,Directors and Key Employees [Member]        
Note 6 - Stock Option Plan (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%