Note 12 - Earnings Per Common Share - Earnings per Common Share from Continuing Operations and Discontinued Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Net earnings	$ 11,654	$ 18,105	$ 25,790	$ 38,811
Deduct preferred stock dividends paid	6	6	12	12
Undistributed net earnings	11,648	18,099	25,778	38,799
Earnings attributable to participating preferred	45	71	99	152
Earnings attributable to common shareholders	$ 11,603	$ 18,028	$ 25,679	$ 38,647
Weighted average common shares outstanding-basic (in shares)	8,810	9,095	8,917	9,106
Basic earnings per common share (in dollars per share)	$ 1.32	$ 1.98	$ 2.88	$ 4.24
Add dividends on convertible preferred stock	$ 5	$ 5	$ 10	$ 10
Earnings attributable to common stock on a diluted basis	$ 11,608	$ 18,033	$ 25,689	$ 38,657
Weighted average common shares outstanding-basic (in shares)	8,810	9,095	8,917	9,106
Additional shares issued related to the equity compensation plan (in shares)	3	2	3	2
Additional shares to be issued under full conversion of preferred stock (in shares)	67	67	67	67
Total shares for diluted (in shares)	8,880	9,164	8,987	9,175
Diluted earnings per common share: (in dollars per share)	$ 1.31	$ 1.97	$ 2.86	$ 4.21