Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	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]	Retained Earnings [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balances at Mar. 31, 2021							$ 585,874	$ 663	$ 3,041	$ 98,502	$ (91,198)	$ (19,067)
Net earnings							14,136	0	0	0	0	0	$ 14,136
Cash dividends declared on preferred stock							(12)	0	0	0	0	0
Equity incentive program							0	0	0	25	0	0
Purchase treasury stock					$ (4,600)		0	0	0	0	(4,552)	0
Balances at Jul. 03, 2021							599,998	663	3,041	98,527	(95,750)	(19,067)	587,412
Balances at Mar. 31, 2022							636,858	644	3,041	98,641	(128,879)	(26,468)	583,837
Net earnings							5,103	0	0	0	0	0	5,103
Cash dividends declared on preferred stock							(12)	0	0	0	0	0
Issue stock for bonus program							0	0	1	76	0	0
Equity incentive program							0	0	0	33	0	0
Purchase treasury stock					$ (15,900)		0	0	0	0	(15,923)	0
Balances at Jul. 02, 2022							$ 641,949	$ 644	$ 3,042	$ 98,750	$ (144,802)	$ (26,468)	$ 573,115
Preferred stock, shares authorized (in shares)	200,000	1,400,000	32,256	500
Common stock, shares authorized (in shares)					20,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	200,000	807,240	32,256	500
Common stock, shares outstanding (in shares)					6,333,277	1,707,249