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STOCK COMPENSATION - NONVESTED SHARES (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
2005 Restricted Stock Grant Plan | Restricted stock        
Stock Based Compensation        
Number of shares authorized for issuance 50,000   50,000  
Shares available for issuance 0   0  
Shares        
Nonvested at the beginning of the period (in shares)     6,141  
Granted (in shares)     0 0
Vested (in shares)     (3,090)  
Forfeited (in shares) (18) (117) (89) (117)
Nonvested at the end of the period (in shares) 2,962   2,962  
Weighted-Average Grant-Date Fair Value        
Nonvested shares, balance at the beginning of the period (in dollars)     $ 151,984  
Vested (in dollars)     (72,224)  
Forfeited (in dollars)     (2,356)  
Nonvested shares, balance at the end of the period (in dollars) $ 77,404   $ 77,404  
Fair Value Per Share        
Nonvested shares, balance at the beginning of the period (in dollars per share)     $ 24.75  
Vested (in dollars per share)     23.37  
Forfeited (in dollars per share)     26.48  
Nonvested shares, balance at the end of the period (in dollars per share) $ 26.13   $ 26.13  
Additional disclosures        
Total unrecognized compensation cost related to nonvested shares granted $ 64,000   $ 64,000  
Period over which cost is expected to be recognized     1 year 1 month 6 days  
2009 Stock Award Plan        
Stock Based Compensation        
Number of shares authorized for issuance 150,000   150,000  
Shares available for issuance 127,218   127,218  
Shares        
Nonvested at the beginning of the period (in shares)     10,930  
Granted (in shares)     5,720 6,575
Vested (in shares)     (2,448)  
Forfeited (in shares)     (408) (951)
Nonvested at the end of the period (in shares) 13,794   13,794  
Weighted-Average Grant-Date Fair Value        
Nonvested shares, balance at the beginning of the period (in dollars)     $ 338,545  
Granted (in dollars)     263,406  
Vested (in dollars)     (74,504)  
Forfeited (in dollars)     (15,154)  
Nonvested shares, balance at the end of the period (in dollars) $ 512,293   $ 512,293  
Fair Value Per Share        
Nonvested shares, balance at the beginning of the period (in dollars per share)     $ 30.97  
Granted (in dollars per share)     46.05  
Vested (in dollars per share)     30.43  
Forfeited (in dollars per share)     37.14  
Nonvested shares, balance at the end of the period (in dollars per share) $ 37.14   $ 37.14  
Additional disclosures        
Total unrecognized compensation cost related to nonvested shares granted $ 480,000   $ 480,000  
2009 Stock Award Plan | Restricted stock        
Additional disclosures        
Period over which cost is expected to be recognized     3 years 6 months