XML 54 R43.htm IDEA: XBRL DOCUMENT v3.19.1
Note 6 - Stock-based Compensation Plan (Details Textual) - USD ($)
3 Months Ended
Feb. 19, 2019
Feb. 20, 2018
May 20, 2009
Mar. 31, 2019
Mar. 31, 2018
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       9,750  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 52.09  
Share-based Payment Arrangement, Expense       $ 56,000 $ 49,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 1,100,000  
Share-based Payment Arrangement, Nonvested Award, 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 9,750 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 $ 52.09 $ 37.42      
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 508,000 $ 748,000      
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Share-based Payment Arrangement, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%        
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       176,150  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years