Note 10 - Income (loss) Per Share - Shares Included in Diluted EPS Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Jun. 29, 2019	Sep. 26, 2020	Sep. 28, 2019
Net income (loss)	$ (477)	$ 44	$ 15	$ (405)	$ 59
Weighted average basic shares outstanding (in shares)	2,636	780		2,636	780
Effect of dilutive securities (in shares)					800
Weighted-average dilutive shares (in shares)	2,636	1,580		2,636	1,580
Basic earnings per share (in dollars per share)	$ (0.18)	$ 0.06		$ (0.15)	$ 0.08
Diluted earnings per share (in dollars per share)	$ (0.18)	$ 0.03		$ (0.15)	$ 0.04
Share-based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)				251
Restricted Stock [Member]
Anti-dilutive securities (in shares)				10
Convertible Debt Securities [Member]
Anti-dilutive securities (in shares)				180
Warrant [Member]
Anti-dilutive securities (in shares)				91