Note 3 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Net earnings	$ 16,131	$ 11,654	$ 21,234	$ 25,790
Deduct preferred stock dividends paid	6	6	12	12
Undistributed net earnings	16,125	11,648	21,222	25,778
Earnings attributable to participating preferred	65	45	85	99
Earnings attributable to common shareholders	$ 16,060	$ 11,603	$ 21,137	$ 25,679
Weighted average common shares outstanding (in shares)	7,836	8,810	7,995	8,917
Basic earnings per common share (in dollars per share)	$ 2.05	$ 1.32	$ 2.64	$ 2.88
Earnings attributable to common shareholders	$ 16,060	$ 11,603	$ 21,137	$ 25,679
Add dividends on convertible preferred stock	5	5	10	10
Earnings attributable to common stock on a diluted basis	$ 16,065	$ 11,608	$ 21,147	$ 25,689
Additional shares issued related to the equity compensation plan (in shares)	3	3	3	3
Additional shares to be issued under full conversion of preferred stock (in shares)	67	67	67	67
Total shares for diluted (in shares)	7,906	8,880	8,065	8,987
Diluted earnings per common share (in dollars per share)	$ 2.03	$ 1.31	$ 2.62	$ 2.86