CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 38,026	$ 23,644
Accounts receivable, less allowance of $25,174 and $18,107 at December 31, 2020 and 2019, respectively	30,021	20,652
Inventories	2,394	1,608
Prepaid income taxes and income taxes receivable	0	383
Prepaid expenses and other current assets	3,723	4,190
Total current assets	74,164	50,477
PROPERTY, EQUIPMENT AND FACILITIES - At cost, net of accumulated depreciation and amortization of $176,300 and $172,408 at December 31, 2020 and 2019, respectively	48,388	49,345
OTHER ASSETS:
Noncurrent restricted cash	0	15,000
Noncurrent receivables, less allowance of $3,465 and $2,260 at December 31, 2020 and 2019, respectively	16,463	15,337
Deferred income taxes, net	35,718	0
Operating lease right-of-use assets	55,187	49,065
Goodwill	14,536	14,536
Other assets, net	734	1,003
Total other assets	122,638	94,941
TOTAL ASSETS	245,190	194,763
CURRENT LIABILITIES:
Current portion of credit agreement	2,000	2,000
Unearned tuition	23,453	23,411
Accounts payable	15,676	14,584
Accrued expenses	16,692	7,869
Income taxes payable	491	0
Current portion of operating lease liabilities	8,504	9,142
Other short-term liabilities	26	199
Total current liabilities	66,842	57,205
NONCURRENT LIABILITIES:
Long-term credit agreement	15,212	32,028
Pension plan liabilities	4,252	4,015
Deferred income taxes, net	0	153
Long-term portion of operating lease liabilities	52,702	46,018
Other long-term liabilities	3,133	214
Total liabilities	142,141	139,633
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Common stock, no par value - authorized 100,000,000 shares at December 31, 2020 and 2019, issued and outstanding 26,476,329 shares at December 31, 2020 and 25,231,710 shares at December 31, 2019	141,377	141,377
Additional paid-in capital	30,512	30,145
Treasury stock at cost - 5,910,541 shares at December 31, 2020 and 2019	(82,860)	(82,860)
Retained earnings (accumulated deficit)	6,203	(42,058)
Accumulated other comprehensive loss	(4,165)	(3,456)
Total stockholders' equity	91,067	43,148
TOTAL LIABILITIES, SERIES A CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY	245,190	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 December 31, 2020 and no shares issued and outstanding at December 31, 2019	11,982	11,982
STOCKHOLDERS' EQUITY:
Total stockholders' equity	$ 11,982	$ 11,982