XML 55 R44.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 6 - Stock Option Plan (Details Textual) - USD ($)
3 Months Ended
Feb. 20, 2018
Feb. 17, 2015
May 20, 2009
Mar. 31, 2018
Mar. 31, 2017
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       20,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 37.42  
Allocated Share-based Compensation Expense, Total       $ 49,000 $ 21,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total       $ 911,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       5 years 91 days  
Restricted Stock [Member] | Officers, Directors and Key Employees [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 20,000 19,500      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 37.42 $ 24.50      
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 748,000 $ 478,000      
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Vesting Each Year on July 1, Beginning in 2019 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%        
Equity Incentive Plan 2009 [Member]          
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  
Equity Incentive Plan 2009 [Member] | Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     223,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       184,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years