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STOCK BASED COMPENSATION (Details Textual) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 135,205 147,184
Share Based Compensation Arrangement By Share Based Payment Award Options Price Per Share Common Stock Average High And Low Price Intrinsic Value $ 72.33  
Stock options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 28,500 [1] 38,500
Options outstanding, vested, and exercisable at December 31, 2020 [1] 28,500  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 0 1,666
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 181,505 [2] 193,784
Weighted average remaining recognition period (years) 2 years 11 months 15 days  
Director [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 20,000  
Director [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 10,300  
Two Thousand Eighteen Nonemployee Director Stock Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000  
Two Thousand Five Amended and Restated Employee Stock Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,650,000  
Two Thousand Ten Nonemployee Director Stock Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 314,600  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 174,855  
[1] Inclusive of 20,000 vested stock options outstanding to Directors.
[2] Inclusive of 10,300 restricted stock awards outstanding to Directors.