Note 3 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 30, 2023	Dec. 31, 2022
Net earnings	$ 17,675	$ 21,054	$ 65,565	$ 42,288
Deduct preferred stock dividends paid	6	6	17	17
Undistributed net earnings	17,669	21,048	65,548	42,271
Earnings attributable to participating preferred shareholders	21	82	73	169
Earnings attributable to common shareholders	$ 17,648	$ 20,966	$ 65,475	$ 42,102
Weighted average common shares outstanding (in shares)	7,131	7,582	7,391	7,858
Basic earnings per common share (in dollars per share)	$ 2.47	$ 2.77	$ 8.86	$ 5.36
Earnings attributable to common shareholders	$ 17,648	$ 20,966	$ 65,475	$ 42,102
Add dividends on convertible preferred stock	5	5	15	15
Earnings attributable to common stock on a diluted basis	$ 17,653	$ 20,971	$ 65,490	$ 42,117
Additional shares issued related to the equity compensation plan (in shares)	4	6	4	6
Additional shares to be issued under full conversion of preferred stock (in shares)	67	67	67	67
Total shares for diluted (in shares)	7,202	7,655	7,462	7,931
Diluted earnings per common share (in dollars per share)	$ 2.45	$ 2.74	$ 8.78	$ 5.31