Note 3 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Net earnings	$ 24,779	$ 16,131	$ 47,890	$ 21,234
Deduct preferred stock dividends paid	6	6	12	12
Undistributed net earnings	24,773	16,125	47,878	21,222
Earnings attributable to participating preferred	28	65	53	85
Earnings attributable to common shareholders	$ 24,745	$ 16,060	$ 47,825	$ 21,137
Weighted average common shares outstanding (in shares)	7,445	7,836	7,521	7,995
Basic earnings per common share (in dollars per share)	$ 3.32	$ 2.05	$ 6.36	$ 2.64
Earnings attributable to common shareholders	$ 24,745	$ 16,060	$ 47,825	$ 21,137
Add dividends on convertible preferred stock	5	5	10	10
Earnings attributable to common stock on a diluted basis	$ 24,750	$ 16,065	$ 47,835	$ 21,147
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)	7,515	7,906	7,591	8,065
Diluted earnings per common share (in dollars per share)	$ 3.29	$ 2.03	$ 6.3	$ 2.62