CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 9,741	$ 23,644
Accounts receivable, less allowance of $19,687 and $18,107 at March 31, 2020 and December 31, 2019, respectively	26,504	20,652
Inventories	1,835	1,608
Prepaid income taxes and income taxes receivable	312	383
Prepaid expenses and other current assets	4,100	4,190
Total current assets	42,492	50,477
PROPERTY, EQUIPMENT AND FACILITIES - At cost, net of accumulated depreciation and amortization of $173,483 and $172,408 at March 31, 2020 and December 31, 2019, respectively	49,367	49,345
OTHER ASSETS:
Noncurrent restricted cash	0	15,000
Noncurrent receivables, less allowance of $2,555 and $2,260 at March 31, 2020 and December 31, 2019, respectively	14,769	15,337
Operating lease right-of-use assets	47,088	49,065
Goodwill	14,536	14,536
Other assets, net	999	1,003
Total other assets	77,392	94,941
TOTAL ASSETS	169,251	194,763
CURRENT LIABILITIES:
Current portion of credit agreement	2,000	2,000
Unearned tuition	18,284	23,411
Accounts payable	12,699	14,584
Accrued expenses	8,592	7,869
Current portion of operating lease liabilities	9,372	9,142
Other short-term liabilities	133	199
Total current liabilities	51,080	57,205
NONCURRENT LIABILITIES:
Long-term credit agreement and term loan	16,576	32,028
Pension plan liabilities	3,932	4,015
Deferred income taxes, net	153	153
Long-term portion of operating lease liabilities	43,680	46,018
Other long-term liabilities	939	214
Total liabilities	116,360	139,633
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Common stock, no par value - authorized: 100,000,000 shares at March 31, 2020 and December 31, 2019; issued and outstanding: 32,275,062 shares at March 31, 2020 and 31,142,251 shares at December 31, 2019	141,377	141,377
Additional paid-in capital	30,264	30,145
Treasury stock at cost - 5,910,541 shares at March 31, 2020 and December 31, 2019	(82,860)	(82,860)
Accumulated deficit	(43,808)	(42,058)
Accumulated other comprehensive loss	(4,064)	(3,456)
Total stockholders' equity	40,909	43,148
TOTAL LIABILITIES, SERIES A CONVERTIBLE PREFERRED STOCK AND EQUITY	169,251	194,763
Series A Convertible Preferred Stock [Member]
SERIES A CONVERTIBLE PREFERRED STOCK
Preferred stock, no par value - 10,000,000 shares authorized, Series A convertible preferred shares, 12,700 shares issued and outstanding at March 31, 2020 and December 31, 2019	11,982	11,982
STOCKHOLDERS' EQUITY:
Total stockholders' equity	$ 11,982	$ 11,982