Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUE RECOGNITION [Abstract]
Unearned tuition	$ 23,411				$ 22,545				$ 23,411	$ 22,545
Revenue recognized included in contract liability									21,700
Disaggregation of Revenue [Abstract]
Total revenues	$ 73,915	$ 72,594	$ 63,569	$ 63,263	$ 70,113	$ 70,078	$ 61,120	$ 61,889	273,342	263,200	$ 261,853
Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									16,402	14,257	11,875
Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									256,940	248,943	249,978
Transportation and Skilled Trades Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues									193,722	185,263	181,328
Transportation and Skilled Trades Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									11,881	10,351	8,987
Transportation and Skilled Trades Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									181,841	174,912	172,341
Healthcare and Other Professions Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues									79,620	72,135	63,641
Healthcare and Other Professions Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									4,521	3,834	2,860
Healthcare and Other Professions Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									75,099	68,301	60,781
Transitional Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues									0	5,802	16,884
Transitional Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									0	72	28
Transitional Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues									$ 0	$ 5,730	$ 16,856