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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Abstract]
Total revenues	$ 72,594	$ 70,078	$ 199,427	$ 193,087
Unearned tuition	22,901		22,901		$ 22,545
Revenue recognized included in contract liability			21,500
ASU 2016-10 [Member]
Disaggregation of Revenue [Abstract]
Unearned tuition	22,900		22,900		$ 22,500
Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	6,100	5,732	12,901	11,128
Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	66,494	64,346	186,526	181,959
Transportation and Skilled Trades Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	52,652	51,006	141,006	135,838
Transportation and Skilled Trades Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	4,792	4,514	9,360	8,219
Transportation and Skilled Trades Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	47,860	46,492	131,646	127,619
Healthcare and Other Professions Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	19,942	18,251	58,421	52,554
Healthcare and Other Professions Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	1,308	1,162	3,541	2,847
Healthcare and Other Professions Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	18,634	17,089	54,880	49,707
Transitional Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	0	821	0	4,695
Transitional Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	0	56	0	62
Transitional Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	$ 0	$ 765	$ 0	$ 4,633