Other Significant Transactions - Additional Information (Details)				3 Months Ended	12 Months Ended			40 Months Ended
	Aug. 05, 2016 $ / shares	Aug. 09, 2013 USD ($) wireless_device	Apr. 26, 2012 USD ($)	Mar. 15, 2017 USD ($)	Feb. 28, 2018 USD ($)	Feb. 28, 2017 USD ($)	Feb. 29, 2016 USD ($)	Dec. 07, 2016 USD ($)	May 30, 2012 USD ($)
Long-term Purchase Commitment [Line Items]
Debt, Face Amount									$ 82,200,000
Proposed Merger Per Share Amount | $ / shares	$ 4.10
Potential Going Private Transaction Costs						$ 900,000
Call option, maximum ownership interest allowed to be exercised by radio operator		30.00%
Payments on Pre-load Agreement								$ 33,200,000
Amended Pre-load commitment				$ 6,000,000
Pre-load Commitment Forgiven				$ 5,800,000
NextRadio
Long-term Purchase Commitment [Line Items]
Period of agreement		3 years
Agreement amount		$ 15,000,000
Variable interest entity, consolidated, carrying amount of assets						100,000
Variable interest entity, liabilities					$ 4,200,000	3,500,000
NextRadio | Minimum
Long-term Purchase Commitment [Line Items]
Minimum number of devices with pre-loaded smartphone application | wireless_device		30,000,000
Emmis
Long-term Purchase Commitment [Line Items]
Expense recognized in period					300,000		$ 400,000
Non-Recourse Debt [Member]
Long-term Purchase Commitment [Line Items]
Nonrecourse Debt, Maximum Borrowing					4,000,000
Other nonrecourse debt [Member]
Long-term Purchase Commitment [Line Items]
Debt, Face Amount					$ 10,200,000.0	$ 9,500,000.0
Local Programming And Marketing Agreement
Long-term Purchase Commitment [Line Items]
Proceeds from License Fees Received			$ 8,400,000
Annual license fees increased in percent					3.50%