SHAREHOLDERS' EQUITY (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Feb. 25, 2016	Jan. 14, 2016	May 07, 2014	Jan. 11, 2010
Calculation of weighted average common shares
Weighted average common shares, basic	11,965,000	11,795,000	11,896,000	11,863,000
Effect of dilutive securities
Effect of stock options (in shares)	1,557,000	869,000	1,564,000	855,000
Effect of dilutive share awards (in shares)	82,000	66,000	92,000	82,000
Weighted average common shares, diluted	13,604,000	12,730,000	13,552,000	12,800,000
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares)			0
Common stock repurchases
Value of common stock authorized to be repurchased					$ 40,000,000	$ 50,000,000	$ 10,000,000	$ 10,000,000
Purchase of treasury stock (in shares)	0		0	686,627
Remaining authorized repurchase amount	$ 48,700,000		$ 48,700,000