Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 73,279,000	$ 73,803,000	$ 221,163,000	$ 234,514,000
Costs and expenses:
Instructional costs and services	28,723,000	28,357,000	87,513,000	86,968,000
Selling and promotional	14,640,000	13,139,000	44,083,000	44,592,000
General and administrative	17,237,000	17,125,000	51,625,000	50,703,000
Loss on disposals of long-lived assets	390,000	5,145,000	1,558,000	5,870,000
Impairment of goodwill	0	4,735,000	0	4,735,000
Depreciation and amortization	4,690,000	4,910,000	14,160,000	14,624,000
Total costs and expenses	65,680,000	73,411,000	198,939,000	207,492,000
Income from operations before interest income and income taxes	7,599,000	392,000	22,224,000	27,022,000
Interest income	17,000	37,000	43,000	111,000
Income before income taxes	7,616,000	429,000	22,267,000	27,133,000
Income tax expense	3,294,000	85,000	9,668,000	10,524,000
Equity investment income (loss)	44,000	(18,000)	105,000	653,000
Net income	$ 4,366,000	$ 326,000	$ 12,704,000	$ 17,262,000
Net Income per common share:
Basic (in dollars per share)	$ 0.27	$ 0.02	$ 0.78	$ 1.07
Diluted (in dollars per share)	$ 0.27	$ 0.02	$ 0.78	$ 1.07
Weighted average number of common shares:
Basic (in shares)	16,248,623	16,074,701	16,225,869	16,057,710
Diluted (in shares)	16,375,512	16,233,229	16,351,563	16,174,723