Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)	Cumulative Preferred Stock [Member]	Cumulative Convertible Preferred Stock [Member]	Participating Convertible Preferred Stock [Member]	Series 2003 Convertible Preferred Stock [Member]	Common Class A [Member]	Common Class B [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Mar. 31, 2018							$ 707,000	$ 3,038,000	$ 98,161,000	$ (69,556,000)	$ (25,067,000)	$ 403,780,000
Net earnings (loss)												(8,755,000)
Cash dividends paid on preferred stock												(12,000)
Equity incentive program									25,000
Change in pension, post retirement benefits and other (net of tax)											(51,000)
Balance at Jun. 30, 2018							707,000	3,038,000	98,186,000	(69,556,000)	(25,118,000)	395,013,000
Balance at Mar. 31, 2018							707,000	3,038,000	98,161,000	(69,556,000)	(25,067,000)	403,780,000
Net earnings (loss)													$ 361,000
Change in pension, post retirement benefits and other (net of tax)													102,000
Balance at Sep. 29, 2018							707,000	3,038,000	98,211,000	(71,135,000)	(25,169,000)	404,129,000	409,781,000
Balance at Jun. 30, 2018							707,000	3,038,000	98,186,000	(69,556,000)	(25,118,000)	395,013,000
Net earnings (loss)												9,116,000	9,116,000
Equity incentive program									25,000
Purchase treasury stock										(1,579,000)
Change in pension, post retirement benefits and other (net of tax)											(51,000)		51,000
Balance at Sep. 29, 2018							707,000	3,038,000	98,211,000	(71,135,000)	(25,169,000)	404,129,000	409,781,000
Balance at Mar. 31, 2019							707,000	3,039,000	98,260,000	(75,740,000)	(18,285,000)	409,504,000	417,485,000
Net earnings (loss)												1,103,000
Cash dividends paid on preferred stock												(12,000)
Equity incentive program									25,000
Purchase treasury stock										(2,744,000)
Operating lease impairment adjustment upon the adoption of ASU 2016-02 "Leases" (net of tax)												(2,019,000)
Balance at Jun. 29, 2019							707,000	3,039,000	98,285,000	(78,484,000)	(18,285,000)	408,576,000
Balance at Mar. 31, 2019							707,000	3,039,000	98,260,000	(75,740,000)	(18,285,000)	409,504,000	417,485,000
Net earnings (loss)													5,738,000
Purchase treasury stock					$ (5,054,000)	$ (3,526,000)
Change in pension, post retirement benefits and other (net of tax)
Balance at Sep. 28, 2019							703,000	3,040,000	98,313,000	(84,320,000)	(18,285,000)	413,211,000	412,662,000
Balance at Jun. 29, 2019							707,000	3,039,000	98,285,000	(78,484,000)	(18,285,000)	408,576,000
Net earnings (loss)												4,635,000	4,635,000
Equity incentive program									25,000
Purchase treasury stock										(5,836,000)
Preferred stock conversion							(4,000)	1,000	3,000
Change in pension, post retirement benefits and other (net of tax)
Balance at Sep. 28, 2019							$ 703,000	$ 3,040,000	$ 98,313,000	$ (84,320,000)	$ (18,285,000)	$ 413,211,000	$ 412,662,000
Preferred stock, shares authorized (in shares)	200,000	1,400,000	37,155	500
Common stock, shares authorized (in shares)					20,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	200,000	807,240	37,155	500
Common stock, shares outstanding (in shares)					7,481,479	1,753,136