Note 12 - Earnings (Loss) 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
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Net Earnings (Loss) From Continuing Operations	$ 4,635	$ (5,634)	$ 5,738	$ (7,794)
Deduct preferred stock dividends paid	6	6	12	12
Undistributed earnings (loss) from continuing operations	4,629	(5,640)	5,726	(7,806)
Earnings (loss) from continuing operations attributable to participating preferred	19	(22)	23	(30)
Earnings (loss) from continuing operations attributable to common shareholders	$ 4,610	$ (5,618)	$ 5,703	$ (7,776)
Weighted average common shares outstanding-basic (in shares)	9,267	9,713	9,372	9,729
Continuing Operations (in dollars per share)	$ 0.50	$ (0.58)	$ 0.61	$ (0.80)
Earnings (loss) from continuing operations attributable to common shareholders	$ 4,610	$ (5,618)	$ 5,703	$ (7,776)
Add dividends on convertible preferred stock	5		10
Earnings (loss) from continuing operations attributable to common stock on a diluted basis	$ 4,615	$ (5,618)	$ 5,713	$ (7,776)
Weighted average common shares outstanding-basic (in shares)	9,267	9,713	9,372	9,729
Additional shares issued related to the equity compensation plan (in shares)	2		2
Additional shares to be issued under full conversion of preferred stock (in shares)	67		67
Total shares for diluted (in shares)	9,336	9,713	9,441	9,729
Diluted earnings (loss) per common share from continuing operations (in dollars per share)	$ 0.49	$ (0.58)	$ 0.61	$ (0.80)
Net Earnings From Discontinued Operations (Net of Tax)		$ 14,750		$ 8,155
Deduct preferred stock dividends paid		6		12
Undistributed earnings from discontinued operations		14,744		8,143
Earnings from discontinued operations attributable to participating preferred		57		32
Earnings from discontinued operations attributable to common shareholders		$ 14,687		$ 8,111
Discontinued Operations (in dollars per share)		$ 1.51		$ 0.83
Earnings from discontinued operations attributable to common shareholders		$ 14,687		$ 8,111
Add dividends on convertible preferred stock		5		10
Earnings from continuing operations attributable to common stock on a diluted basis		$ 14,692		$ 8,121
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	$ 67	$ 67	$ 67	$ 67
Total shares for diluted (in shares)	9,336	9,782	9,441	9,798
Diluted earnings per common share from discontinued operations (in dollars per share)		$ 1.50		$ 0.83