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STOCK-BASED COMPENSATION PLANS - Summary of activity of stock options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares Under Option      
Exercised (500) (34,000) (31,697)
Stock Options      
Shares Under Option      
Outstanding at Beginning of Period 38,000 72,000 104,000
Granted
Exercised (1,000) (34,000) (32,000)
Forfeited and cancelled
Outstanding at End of Period 37,000 38,000 72,000
Options exercisable at year end 37,000 38,000 72,000
Weighted Average Exercise Price      
Outstanding at Beginning of Period $ 5.49 $ 5.49 $ 5.60
Granted
Exercised 5.49 5.49 5.86
Forfeited and cancelled
Outstanding at End of Period 5.49 5.49 5.49
Options exercisable at year end $ 5.49 $ 5.49 $ 5.49