SUMMARY OF QUARTERLY DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
SUMMARY OF QUARTERLY DATA (UNAUDITED) [Abstract]
Revenues	$ 52,017	$ 56,051	$ 50,471	$ 44,054	$ 39,216	$ 38,318	$ 43,541	$ 40,956	$ 202,593	$ 162,031	$ 180,878
Gross profit	23,609	27,268	22,395	20,351	20,989	19,415	22,176	21,370	108,970	83,950	100,975
Income from continuing operations, net of tax	3,802	6,215	5,712	5,074	4,134	3,681	4,482	3,932	20,803	16,229	31,127
Loss from discontinued operations, net of tax	(153)	(330)	(312)	(359)	(396)	(459)	(486)	(703)	(1,154)	(2,044)	(3,668)
Gain on sale of discontinued operations, net of tax	7,682	0	0	0					7,682	0	0
Net income	$ 11,331	$ 5,885	$ 5,400	$ 4,715	$ 3,738	$ 3,222	$ 3,996	$ 3,229	$ 27,331	$ 14,185	$ 27,459
Basic [Abstract]
Continuing operations (in dollars per share)	$ 0.17	$ 0.27	$ 0.25	$ 0.23	$ 0.19	$ 0.16	$ 0.20	$ 0.18	$ 0.92	$ 0.73	$ 1.42
Discontinued operations (in dollars per share)	$ 0.33	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.02)	$ (0.02)	$ (0.02)	$ (0.03)	$ 0.29	$ (0.09)	$ (0.17)
Basic net income per share (in dollars per share)	$ 0.50	$ 0.26	$ 0.24	$ 0.21	$ 0.17	$ 0.14	$ 0.18	$ 0.15	$ 1.21	$ 0.64	$ 1.25
Diluted [Abstract]
Continuing operations (in dollars per share)	$ 0.17	$ 0.27	$ 0.25	$ 0.23	$ 0.19	$ 0.16	$ 0.20	$ 0.17	$ 0.91	$ 0.72	$ 1.39
Discontinued operations (in dollars per share)	$ 0.33	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.02)	$ (0.02)	$ (0.02)	$ (0.03)	$ 0.29	$ (0.09)	$ (0.16)
Diluted net income per share (in dollars per share)	$ 0.50	$ 0.26	$ 0.24	$ 0.21	$ 0.17	$ 0.14	$ 0.18	$ 0.14	$ 1.20	$ 0.63	$ 1.23
Cash dividend declared (in dollars per share)	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0	$ 0	$ 0	$ 0	$ 0.40	$ 0	$ 1.00