Summary of Significant Accounting Policies - Results of Operations of Disposal Groups (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income before taxes	$ 7,198	$ 5,208	$ 12,486	$ 11,020
Austin Radio Partnership
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net revenues	8,592	8,456	16,879	16,465
Station operating expenses, excluding depreciation and amortization	5,889	5,593	11,416	10,742
Depreciation and amortization		130	120	271
Interest expense	85	141	259	278
Income before taxes	2,618	2,592	5,084	5,174
WQHT-FM and WBLS-FM
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net revenues	16,314	14,196	26,152	23,511
Station operating expenses, excluding depreciation and amortization	11,585	11,197	18,166	16,902
Depreciation and amortization	94	292	417	584
Interest expense	55	91	167	179
Income before taxes	$ 4,580	$ 2,616	$ 7,402	$ 5,846