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		6 Months Ended
REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Abstract]
Total revenues	$ 63,569	$ 61,120	$ 126,833	$ 123,009
Unearned tuition	19,716		19,716		$ 22,545
Revenue recognized included in contract liability			21,300
ASU 2016-10 [Member]
Disaggregation of Revenue [Abstract]
Unearned tuition	19,700		19,700		$ 22,500
Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	3,646	2,614	6,801	5,396
Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	59,923	58,506	120,032	117,613
Transportation and Skilled Trades Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	44,028	42,085	88,354	84,832
Transportation and Skilled Trades Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	2,487	1,657	4,568	3,705
Transportation and Skilled Trades Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	41,541	40,428	83,786	81,127
Healthcare and Other Professions Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	19,541	17,562	38,479	34,304
Healthcare and Other Professions Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	1,159	954	2,233	1,686
Healthcare and Other Professions Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	18,382	16,608	36,246	32,618
Transitional Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	0	1,473	0	3,873
Transitional Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	0	3	0	5
Transitional Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	$ 0	$ 1,470	$ 0	$ 3,868