Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income	$ 17,752,000	$ 18,822,000	$ 10,013,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,832,000	12,984,000	15,596,000
Amortization of debt issuance costs	885,000	0	0
Stock-based compensation	7,654,000	7,075,000	5,960,000
Equity investment loss	831,000	7,000	1,464,000
Deferred income taxes	5,530,000	(811,000)	(1,973,000)
Loss on disposal of long-lived assets	1,282,000	851,000	556,000
Impairment of goodwill	0	0	7,336,000
Other	15,000	24,000	145,000
Changes in operating assets and liabilities:
Accounts receivable, net of allowance for bad debt	(7,637,000)	(6,327,000)	2,734,000
Prepaid expenses	(614,000)	320,000	(1,149,000)
Income tax receivable/payable	(5,481,000)	1,935,000	(859,000)
Operating lease assets, net	2,606,000	(16,000)	120,000
Other assets	(1,517,000)	(165,000)	550,000
Accounts payable	8,026,000	(86,000)	(5,564,000)
Accrued compensation and benefits	(3,406,000)	1,907,000	653,000
Accrued liabilities	(4,432,000)	3,612,000	3,672,000
Deferred revenue and student deposits	(23,061,000)	4,678,000	(884,000)
Net cash provided by operating activities	16,265,000	44,810,000	38,370,000
Investing activities
Cash paid for acquisition, net of cash acquired	(325,509,000)	0	0
Capital expenditures	(11,828,000)	(4,926,000)	(7,255,000)
Proceeds from the sale of real property	672,000	767,000	0
Net cash used in investing activities	(336,665,000)	(4,159,000)	(7,255,000)
Financing activities
Cash paid for repurchase of common/restricted stock	(3,032,000)	(15,705,000)	(40,506,000)
Cash received from issuance of common stock	86,205,000	0	0
Cash paid for principal on borrowings	(2,188,000)	0	0
Cash received from borrowings	175,000,000	0	0
Cash paid for debt issuance costs	(13,644,000)	0	0
Net cash used in financing activities	242,341,000	(15,705,000)	(40,506,000)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(78,059,000)	24,946,000	(9,391,000)
Cash, cash equivalents, and restricted cash at beginning of period	227,686,000	202,740,000	212,131,000
Cash, cash equivalents, and restricted cash at end of period	149,627,000	227,686,000	202,740,000
Supplemental disclosures of cash flow information
Interest paid	3,676,000	0	0
Income taxes paid	$ 7,464,000	$ 5,898,000	$ 8,019,000