Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Preferred Stock Including Additional Paid in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock Including Additional Paid in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Series E Preferred Stock [Member] Preferred Stock Including Additional Paid in Capital [Member]	Series E Preferred Stock [Member] Common Stock Including Additional Paid in Capital [Member]	Series E Preferred Stock [Member] Retained Earnings [Member]	Series E Preferred Stock [Member]	Series B Preferred Stock [Member] Preferred Stock Including Additional Paid in Capital [Member]	Series B Preferred Stock [Member] Common Stock Including Additional Paid in Capital [Member]	Series B Preferred Stock [Member] Retained Earnings [Member]	Series B Preferred Stock [Member]	Preferred Stock Including Additional Paid in Capital [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2018													62,334	687,510
Balance at Mar. 31, 2018			$ 1,177	$ 1,177									$ 3,613	$ 25,200	$ (28,682)	$ 131
Net loss															(937)	(937)
Restricted stock granted (in shares)														20,667
Restricted stock granted
Restricted stock forfeited (in shares)														(1,667)
Restricted stock forfeited
Stock based compensation														$ 245		245
Shares issued related to loan agreement (in shares)														2,000
Shares issued related to loan agreement
Stock issuance, net of issuance costs (in shares)					56,200			56,200
Stock issuance, net of issuance costs					$ 1,193			$ 1,193
Warrants exercises (in shares)														38,190
Warrants exercises														$ 112		112
Series E dividends															(106)	(106)
Preferred stock converted to common (in shares)					(1,600)	10,667
Preferred stock converted to common
Balance (in shares) at Mar. 30, 2019													116,934	757,367
Balance at Mar. 30, 2019													$ 4,806	$ 25,557	(28,548)	1,815
Net loss															(687)	(687)
Restricted stock granted (in shares)														10,000
Restricted stock granted
Restricted stock forfeited (in shares)														(1,332)
Restricted stock forfeited
Stock based compensation														$ 301		301
Shares issued related to loan agreement (in shares)														167
Shares issued related to loan agreement
Stock issuance, net of issuance costs (in shares)								0						846,001
Stock issuance, net of issuance costs														$ 2,564		2,564
Warrants exercises (in shares)														84,095
Warrants exercises														$ 212		212
Series E dividends															(94)
Preferred stock converted to common (in shares)					(89,200)	890,000			(752)	5,012
Preferred stock converted to common					$ (1,716)	$ 2,961	(1,245)		$ (166)	$ 166
Fractional shares due to reverse stock split (in shares)														(81)
Series E dividends (in shares)														44,627
Series E dividends														$ 189		95
Stock issuance, net of issuance costs					$ (2)	$ 2
Balance (in shares) at Mar. 28, 2020													26,982	2,635,856
Balance at Mar. 28, 2020													$ 2,922	$ 31,952	$ (30,574)	$ 4,300