Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 74,616	$ 73,441
Costs and expenses:
Instructional costs and services	29,230	27,915
Selling and promotional	18,186	15,047
General and administrative	21,003	19,065
Loss on disposals of long-lived assets	166	126
Impairment of goodwill	0	5,855
Depreciation and amortization	3,338	4,051
Total costs and expenses	71,923	72,059
Income from operations before interest income and income taxes	2,693	1,382
Interest income, net	702	1,053
Income before income taxes	3,395	2,435
Income tax expense (benefit)	974	(63)
Equity investment loss	(1)	(1,487)
Net income	$ 2,420	$ 1,011
Net income per common share:
Basic (in dollars per share)	$ 0.16	$ 0.06
Diluted (in dollars per share)	$ 0.16	$ 0.06
Weighted average number of common shares:
Basic (in shares)	15,024,080	16,533,205
Diluted (in shares)	15,116,169	16,662,366