CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 17,250	$ (109)	$ 259	$ 272	$ 17,141	$ 532
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization					2,932	3,057
Deferred income taxes					0	64
Gain on sale of assets					(30,933)	(195)
Impairment of goodwill and long-lived assets	4,220		0		4,220	0
Fixed asset donations					(207)	(145)
Provision for credit losses	10,347				18,600	16,165
Stock-based compensation expense					3,388	1,730
(Increase) decrease in assets:
Accounts receivable					(16,923)	(21,838)
Inventories					63	(361)
Prepaid income taxes and income taxes payable					4,040	(1,793)
Prepaid expenses and current assets					(1,152)	345
Other assets, net					1,194	(84)
Increase (decrease) in liabilities:
Accounts payable					5,646	1,301
Accrued expenses					3,694	(4,782)
Unearned tuition					(1,226)	(3,723)
Other liabilities					(74)	(265)
Total adjustments					(6,738)	(10,524)
Net cash provided by (used in) operating activities					10,403	(9,992)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures					(10,901)	(3,582)
Proceeds from sale of property and equipment					33,310	2,390
Proceeds from short-term investment					14,758	0
Purchase of short-term investment					(24,344)	0
Net cash provided by (used in) investing activities					12,823	(1,192)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividend payment for preferred stock					0	(608)
Share repurchase					(891)	(2,538)
Net share settlement for equity-based compensation					(2,054)	(1,992)
Net cash used in financing activities					(2,945)	(5,138)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH					20,281	(16,322)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - Beginning of period		$ 50,287		$ 83,307	50,287	83,307	$ 83,307
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - End of period	$ 70,568		$ 66,985		70,568	66,985	$ 50,287
Cash paid for:
Interest					94	118
Income taxes					2,169	1,206
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Liabilities accrued for or noncash additions of fixed assets					$ 1,094	$ 591