Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Preferred Stock and Warrants (Details Textual)

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Note 14 - Preferred Stock and Warrants (Details Textual)
 9 Months Ended 12 Months Ended
Nov. 08, 2019
$ / shares
shares
Mar. 28, 2018
USD ($)
$ / shares
shares
Dec. 28, 2019
shares
Mar. 30, 2019
USD ($)
$ / shares
shares
Stock Issued During Period, Shares, New Issues 10,490,000      
Shares Issued, Price Per Share | $ / shares $ 0.25      
Conversion of Series E Preferred Stock into Common Stock [Member]        
Conversion of Stock, Shares Issued 896,636      
Conversion of Stock, Shares Converted 88,600      
Series E Preferred Stock Warrants [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Percentage of Common Shares Into Which the Preferred Shares Can Be Converted   5.00%   5.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   14,867   6.67
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 3.75   $ 3.75
Series E Preferred Stock [Member]        
Stock Issued During Period, Shares, New Issues   42,800 0 57,200
Preferred Stock, Dividend Rate, Percentage   6.00%    
Issuance of Stock, Number of Investors   15    
Shares Issued, Price Per Share | $ / shares   $ 25   $ 25
Proceeds from Issuance of Preferred Stock and Preference Stock | $   $ 1,095,000   $ 1,405,000
Proceeds from Issuance of Preferred Stock and Preference Stock, Net of Issuance Costs | $   $ 1,000,000   $ 1,200,000
Stock Issued During Period, Placement Agent Fees, Percentage of Gross Proceeds   5.00%   5.00%
Payments of Stock Issuance Costs | $   $ 57,000   $ 212,000
Series E Preferred Stock [Member] | Placement Agent [Member]        
Payments of Stock Issuance Costs | $       $ 56,875