Note 11 - Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Net Earnings	$ 4,377	$ 7,789	$ 439	$ 15,575
Deduct preferred stock dividends paid	6	6	17	17
Undistributed earnings	4,371	7,783	422	15,558
Earnings attributable to participating preferred	17	71	2	142
Earnings attributable to common shareholders	$ 4,354	$ 7,712	$ 420	$ 15,416
Weighted average common shares outstanding-basic (in shares)	9,740	9,770	9,782	9,790
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.79	$ 0.04	$ 1.58
Earnings attributable to common shareholders	$ 4,354	$ 7,712	$ 420	$ 15,416
Add dividends on convertible preferred stock	5	5	15	15
Earnings attributable to common stock on a diluted basis	$ 4,359	$ 7,717	$ 435	$ 15,431
Weighted average common shares outstanding-basic (in shares)	9,740	9,770	9,782	9,790
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)	9,809	9,839	9,851	9,859
Diluted earnings per common share (in dollars per share)	$ 0.44	$ 0.78	$ 0.04	$ 1.57