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STOCK BASED COMPENSATION (Details Textual) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 177,191 212,698  
Share Based Compensation Arrangement By Share Based Payment Award Options Price Per Share Common Stock Average High And Low Price Intrinsic Value $ 70.95    
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 84,000 [1] 109,650  
Options outstanding and expected to vest at December 31, 2017 [2] 84,000    
Annualized estimated forfeitures   4.50% 4.50%
Options exercisable at December 31, 2017 [3] 79,001    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 4,999 6,666  
Weighted average remaining recognition period (years) 1 year    
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 225,965 [4] 264,315  
Weighted average remaining recognition period (years) 3 years    
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 38,000    
Options outstanding and expected to vest at December 31, 2017 [1] 38,000    
Options exercisable at December 31, 2017 [1] 33,001    
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 38,445    
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    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 416,513    
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 179,355    
Two Thousand Ten Nonemployee Director Stock Plan [Member] | Maximum [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
[1] Inclusive of 38,000 stock options outstanding to Directors.
[2] Inclusive of 38,000 vested stock options and expected to vest to Directors.
[3] Inclusive of 33,001 vested stock options outstanding to Directors.
[4] Inclusive of 38,445 restricted stock awards outstanding to Directors.