Note 10 - (Loss) Earnings Per Common Share - (Loss) Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Net (Loss) Earnings	$ (1,112)	$ 6,144	$ (1,951)	$ 6,082
Deduct preferred stock dividends paid	6	6	12	12
Undistributed (loss) earnings	(1,118)	6,138	(1,963)	6,070
(Loss) earnings attributable to participating preferred	(4)	56	(11)	56
(Loss) earnings attributable to common shareholders	$ (1,114)	$ 6,082	$ (1,952)	$ 6,014
Weighted average common shares outstanding-basic (in shares)	9,792	9,792	9,803	9,800
Basic (loss) earnings per common share (in dollars per share)	$ (0.11)	$ 0.62	$ (0.20)	$ 0.61
(Loss) earnings attributable to common shareholders	$ (1,114)	$ 6,082	$ (1,952)	$ 6,014
Add dividends on convertible preferred stock	5	5	10	10
(Loss) earnings attributable to common stock on a diluted basis	$ (1,109)	$ 6,087	$ (1,942)	$ 6,024
Additional shares issued related to the equity compensation plan (in shares)		3		3
Additional shares to be issued under full conversion of preferred stock (in shares)		67		67
Total shares for diluted (in shares)	9,792	9,862	9,803	9,870
Diluted (loss) earnings per common share (in dollars per share)	$ (0.11)	$ 0.62	$ (0.20)	$ 0.61