STOCK-BASED COMPENSATION PLANS - Summary of activity of stock options (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shares Under Option
Exercised	(31,697)	(102,314)	(153,775)
Stock Options
Shares Under Option
Outstanding at Beginning of Period	104,000	206,000	360,000
Granted
Exercised	(32,000)	(102,000)	(154,000)
Forfeited and cancelled
Outstanding at End of Period	72,000	104,000	206,000
Options exercisable at year end	72,000	104,000	206,000
Weighted Average Exercise Price
Outstanding at Beginning of Period	5.60	5.83	5.71
Granted
Exercised	5.86	6.07	5.54
Forfeited and cancelled
Outstanding at End of Period	5.49	5.60	5.83
Options exercisable at year end	5.49	5.60	5.83