Segment Reporting (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)	Nov. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)	Feb. 28, 2018 USD ($)
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 129,637,000	$ 156,563,000	$ 339,359,000	$ 384,856,000
Impairment of Intangible Assets, Finite-lived	0	0	$ 9,814,000	0
Number of Reportable Segments			3
Income (Loss) from Equity Method Investments	1,695,000	2,004,000	$ 5,146,000	5,734,000
Interest and Debt Expense	1,174,000	1,215,000	3,391,000	4,850,000
Depreciation and amortization	2,887,000	2,993,000	8,811,000	9,148,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	6,491,000	6,909,000	(11,338,000)	(19,586,000)
Impairment of Long-Lived Assets Held-for-use	0	0	(3,473,000)	0
Cost-method Investments, Realized Gain (Loss)	0	0	0	1,416,000	$ 0
Automotive [Member]
Segment Reporting Information [Line Items]
Impairment of Intangible Assets, Finite-lived			160,000
Consumer Accessories [Member]
Segment Reporting Information [Line Items]
Impairment of Intangible Assets, Finite-lived			9,654,000
Operating Segments [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	45,053,000	40,634,000	124,705,000	110,342,000
Income (Loss) from Equity Method Investments	1,695,000	2,004,000	5,146,000	5,734,000
Interest and Debt Expense	267,000	336,000	752,000	624,000
Depreciation and amortization	186,000	216,000	649,000	768,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	5,596,000	3,486,000	11,121,000	8,910,000
Operating Segments [Member] | Premium Audio [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	49,666,000	57,386,000	121,707,000	135,055,000
Income (Loss) from Equity Method Investments	0	0	0	0
Interest and Debt Expense	1,894,000	2,120,000	5,504,000	6,056,000
Depreciation and amortization	826,000	862,000	2,498,000	2,655,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	6,458,000	6,262,000	9,586,000	1,547,000
Operating Segments [Member] | Consumer Accessories [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	34,661,000	58,461,000	92,264,000	138,976,000
Income (Loss) from Equity Method Investments	0	0	0	0
Interest and Debt Expense	1,958,000	1,857,000	5,633,000	5,303,000
Depreciation and amortization	1,100,000	1,159,000	3,325,000	3,496,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(5,062,000)	(2,013,000)	(28,779,000)	(17,412,000)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	257,000	82,000	683,000	483,000
Income (Loss) from Equity Method Investments	0	0	0	0
Interest and Debt Expense	(2,945,000)	(3,098,000)	(8,498,000)	(7,133,000)
Depreciation and amortization	775,000	756,000	2,339,000	2,229,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(501,000)	$ (826,000)	(3,266,000)	$ (12,631,000)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0		$ 0