CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 33,007	$ 38,026
Accounts receivable, less allowance of $24,073 and $25,174 at June 30, 2021 and December 31, 2020, respectively	31,718	30,021
Inventories	3,327	2,394
Prepaid income taxes	209	0
Prepaid expenses and other current assets	4,239	3,723
Total current assets	72,500	74,164
PROPERTY, EQUIPMENT AND FACILITIES - At cost, net of accumulated depreciation and amortization of $178,391 and $176,300 at June 30, 2021 and December 31, 2020, respectively	51,446	48,388
OTHER ASSETS:
Noncurrent receivables, less allowance of $4,048 and $3,465 at June 30, 2021 and December 31, 2020, respectively	17,536	16,463
Deferred income taxes, net	33,696	35,718
Operating lease right-of-use assets	54,081	55,187
Goodwill	14,536	14,536
Other assets, net	851	734
Total other assets	120,700	122,638
TOTAL ASSETS	244,646	245,190
CURRENT LIABILITIES:
Current portion of credit agreement	2,000	2,000
Unearned tuition	22,183	23,453
Accounts payable	13,385	15,676
Accrued expenses	14,836	16,692
Income taxes payable	0	491
Current portion of operating lease liabilities	10,011	8,504
Other short-term liabilities	59	26
Total current liabilities	62,474	66,842
NONCURRENT LIABILITIES:
Long-term credit agreement	14,303	15,212
Pension plan liabilities	4,650	4,252
Long-term portion of operating lease liabilities	50,628	52,702
Other long-term liabilities	2,868	3,133
Total liabilities	134,923	142,141
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Common stock, no par value - authorized: 100,000,000 shares at June 30, 2021 and December 31, 2020; issued and outstanding: 26,972,165 shares at June 30, 2021 and 26,476,329 shares at December 31, 2020	141,377	141,377
Additional paid-in capital	30,887	30,512
Treasury stock at cost - 5,910,541 shares at June 30, 2021 and December 31, 2020	(82,860)	(82,860)
Retained earnings	12,510	6,203
Accumulated other comprehensive loss	(4,173)	(4,165)
Total stockholders' equity	97,741	91,067
TOTAL LIABILITIES, SERIES A CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY	244,646	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 June 30, 2021 and December 31, 2020	$ 11,982	$ 11,982