Note 13 - Earnings Per Common Share from Continuing Operations - 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
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Net Earnings	$ 18,105	$ 4,635	$ 38,811	$ 5,738
Deduct preferred stock dividends paid	6	6	12	12
Undistributed earnings	18,099	4,629	38,799	5,726
Earnings attributable to participating preferred	71	19	152	23
Earnings attributable to common shareholders	$ 18,028	$ 4,610	$ 38,647	$ 5,703
Weighted average common shares outstanding-basic (in shares)	9,095	9,267	9,106	9,372
Basic earnings per common share (in dollars per share)	$ 1.98	$ 0.50	$ 4.24	$ 0.61
Earnings from attributable to common shareholders	$ 18,028	$ 4,610	$ 38,647	$ 5,703
Add dividends on convertible preferred stock	5	5	10	10
Earnings attributable to common stock on a diluted basis	$ 18,033	$ 4,615	$ 38,657	$ 5,713
Weighted average common shares outstanding-basic (in shares)	9,095	9,267	9,106	9,372
Additional shares issued related to the equity compensation plan (in shares)	2	2	2	2
Additional shares to be issued under full conversion of preferred stock (in shares)	67	67	67	67
Total shares for diluted (in shares)	9,164	9,336	9,175	9,441
Diluted Earnings per Common Share: (in dollars per share)	$ 1.97	$ 0.49	$ 4.21	$ 0.61