CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 65,599	$ 83,307
Accounts receivable, less allowance of $27,545 and $26,837 at March 31, 2022 and December 31, 2021, respectively	34,866	26,159
Inventories	2,640	2,721
Prepaid expenses and other current assets	5,364	4,881
Assets held for sale	4,559	4,559
Total current assets	113,028	121,627
PROPERTY, EQUIPMENT AND FACILITIES - At cost, net of accumulated depreciation and amortization of $150,597 and $153,335 at March 31, 2022 and December 31, 2021, respectively	23,447	23,119
OTHER ASSETS:
Noncurrent receivables, less allowance of $4,513 and $5,084 at March 31, 2022 and December 31, 2021, respectively	16,869	20,028
Deferred income taxes, net	23,644	23,708
Operating lease right-of-use assets	95,377	91,487
Goodwill	14,536	14,536
Other assets, net	787	794
Total other assets	151,213	150,553
TOTAL ASSETS	287,688	295,299
CURRENT LIABILITIES:
Unearned tuition	21,192	25,405
Accounts payable	13,083	12,297
Accrued expenses	9,291	15,669
Income taxes payable	221	1,017
Current portion of operating lease liabilities	11,228	11,479
Other short-term liabilities	32	15
Total current liabilities	55,047	65,882
NONCURRENT LIABILITIES:
Pension plan liabilities	1,509	1,607
Long-term portion of operating lease liabilities	90,547	86,410
Total liabilities	147,103	153,899
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Common stock, no par value - authorized: 100,000,000 shares at March 31, 2022 and December 31, 2021; issued and outstanding: 27,260,154 shares at March 31, 2022 and 27,000,687 shares at December 31, 2021	141,377	141,377
Additional paid-in capital	31,686	32,439
Treasury stock at cost - 5,910,541 shares at March 30, 2022 and December 31, 2021	(82,860)	(82,860)
Retained earnings	39,670	39,702
Accumulated other comprehensive loss	(1,270)	(1,240)
Total stockholders' equity	128,603	129,418
TOTAL LIABILITIES, SERIES A CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY	287,688	295,299
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, 2022 and December 31, 2021	$ 11,982	$ 11,982