CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 26,742	$ 38,026
Accounts receivable, less allowance of $22,539 and $25,174 at March 31, 2021 and December 31, 2020, respectively	30,604	30,021
Inventories	2,666	2,394
Prepaid expenses and other current assets	10,770	3,723
Total current assets	70,782	74,164
PROPERTY, EQUIPMENT AND FACILITIES - At cost, net of accumulated depreciation and amortization of $176,757 and $176,300 at March 31, 2021 and December 31, 2020, respectively	49,035	48,388
OTHER ASSETS:
Noncurrent receivables, less allowance of $3,701 and $3,465 at March 31, 2021 and December 31, 2020, respectively	17,070	16,463
Deferred income taxes, net	34,473	35,718
Operating lease right-of-use assets	53,155	55,187
Goodwill	14,536	14,536
Other assets, net	802	734
Total other assets	120,036	122,638
TOTAL ASSETS	239,853	245,190
CURRENT LIABILITIES:
Current portion of credit agreement	2,000	2,000
Unearned tuition	20,240	23,453
Accounts payable	17,718	15,676
Accrued expenses	10,713	16,692
Income taxes payable	436	491
Current portion of operating lease liabilities	9,370	8,504
Other short-term liabilities	73	26
Total current liabilities	60,550	66,842
NONCURRENT LIABILITIES:
Long-term credit agreement	14,757	15,212
Pension plan liabilities	4,451	4,252
Long-term portion of operating lease liabilities	50,329	52,702
Other long-term liabilities	2,924	3,133
Total liabilities	133,011	142,141
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Common stock, no par value - authorized: 100,000,000 shares at March 31, 2021 and December 31, 2020; issued and outstanding: 26,895,970 shares at March 31, 2021 and 26,476,329 shares at December 31, 2020	141,377	141,377
Additional paid-in capital	30,043	30,512
Treasury stock at cost - 5,910,541 shares at March 31, 2021 and December 31, 2020	(82,860)	(82,860)
Retained earnings	10,388	6,203
Accumulated other comprehensive loss	(4,088)	(4,165)
Total stockholders' equity	94,860	91,067
TOTAL LIABILITIES, SERIES A CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY	239,853	245,190
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, 2021 and December 31, 2020	11,982	11,982
STOCKHOLDERS' EQUITY:
Total stockholders' equity	$ 11,982	$ 11,982