Note 3 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2022	Jan. 01, 2022
Net earnings	$ 21,054	$ 18,664	$ 42,288	$ 44,454
Deduct preferred stock dividends paid	6	6	17	17
Undistributed net earnings	21,048	18,658	42,271	44,437
Earnings attributable to participating preferred	82	72	169	171
Earnings attributable to common shareholders	$ 20,966	$ 18,586	$ 42,102	$ 44,266
Weighted average common shares outstanding (in shares)	7,582	8,603	7,858	8,813
Basic earnings per common share (in dollars per share)	$ 2.77	$ 2.16	$ 5.36	$ 5.02
Earnings attributable to common shareholders	$ 20,966	$ 18,586	$ 42,102	$ 44,266
Add dividends on convertible preferred stock	5	5	15	15
Earnings attributable to common stock on a diluted basis	$ 20,971	$ 18,591	$ 42,117	$ 44,281
Additional shares issued related to the equity compensation plan (in shares)	6	4	6	4
Additional shares to be issued under full conversion of preferred stock (in shares)	67	67	67	67
Total shares for diluted (in shares)	7,655	8,674	7,931	8,884
Diluted earnings per common share (in dollars per share)	$ 2.74	$ 2.14	$ 5.31	$ 4.98