Note 3 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Net earnings	$ 29,739	$ 13,303	$ 44,624	$ 25,964
Deduct preferred stock dividends	0	0	12	12
Undistributed net earnings	29,739	13,303	44,612	25,952
Earnings attributable to participating preferred shareholders	29	16	47	31
Earnings attributable to common shareholders	$ 29,710	$ 13,287	$ 44,565	$ 25,921
Weighted average common shares outstanding (in shares)	6,858	6,915	6,870	6,938
Basic earnings per common share (in dollars per share)	$ 4.33	$ 1.92	$ 6.49	$ 3.74
Earnings attributable to common shareholders	$ 29,710	$ 13,287	$ 44,565	$ 25,921
Add dividends on convertible preferred stock	5	5	10	10
Earnings attributable to common stock on a diluted basis	$ 29,715	$ 13,292	$ 44,575	$ 25,931
Additional shares to be issued under full conversion of preferred stock (in shares)	67	67	67	67
Total shares for diluted (in shares)	6,925	6,982	6,937	7,005
Diluted earnings per common share (in dollars per share)	$ 4.29	$ 1.9	$ 6.43	$ 3.7