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 of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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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
REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
REVENUE RECOGNITION [Abstract]
Unearned tuition	$ 18,284		$ 23,411
Revenue recognized included in contract liability	20,100
Disaggregation of Revenue [Abstract]
Total revenues	70,041	$ 63,263
Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	3,571	3,156
Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	66,470	60,107
Transportation and Skilled Trades Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	49,056	44,325
Transportation and Skilled Trades Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	2,498	2,081
Transportation and Skilled Trades Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	46,558	42,244
Healthcare and Other Professions Segment [Member]
Disaggregation of Revenue [Abstract]
Total revenues	20,985	18,938
Healthcare and Other Professions Segment [Member] \| Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	1,073	1,075
Healthcare and Other Professions Segment [Member] \| Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Total revenues	$ 19,912	$ 17,863