Note 11 - (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	$ (2,958)	$ 6,821	$ (3,938)	$ 7,786
Deduct preferred stock dividends paid	6	6	12	12
Undistributed (loss) earnings	(2,964)	6,815	(3,950)	7,774
(Loss) earnings attributable to participating preferred	(12)	62	(22)	71
(Loss) earnings attributable to common shareholders	$ (2,952)	$ 6,753	$ (3,928)	$ 7,703
Weighted average common shares outstanding-basic (in shares)	9,792	9,792	9,803	9,800
Earnings Per Common Share-Basic (in dollars per share)	$ (0.30)	$ 0.69	$ (0.40)	$ 0.79
(Loss) earnings attributable to common shareholders	$ (2,952)	$ 6,753	$ (3,928)	$ 7,703
Add dividends on convertible preferred stock	5	5	10	10
(Loss) earnings attributable to common stock on a diluted basis	$ (2,947)	$ 6,758	$ (3,918)	$ 7,713
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
Earnings Per Common Share-Diluted (in dollars per share)	$ (0.30)	$ 0.69	$ (0.40)	$ 0.78