Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Sale of Common Stock (Details Textual)

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Note 7 - Sale of Common Stock (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 11, 2020
Nov. 08, 2019
Nov. 07, 2019
Mar. 28, 2018
Dec. 28, 2019
Dec. 26, 2020
Dec. 28, 2019
Mar. 30, 2019
Mar. 28, 2020
[1]
Stock Issued During Period, Shares, New Issues (in shares) 146,668 699,333              
Shares Issued, Price Per Share (in dollars per share) $ 3.75 $ 3.75              
Proceeds from Issuance of Common Stock $ 510,000 $ 2,100,000       $ 2,053,000    
Stock Issued During Period, Value, New Issues $ 550,004       $ 2,053,000        
Series E Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)       42,800   0   57,200  
Shares Issued, Price Per Share (in dollars per share)       $ 25       $ 25  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           9,200     9,200
Preferred Stock, Liquidation Preference, Value           $ 345,000     $ 345,000
Conversion of Series E Preferred Stock into Common Stock [Member]                  
Conversion of Stock, Shares Issued (in shares)   896,636 896,636            
Conversion of Stock, Shares Converted (in shares)   88,600 88,600            
Underwriter Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   20,980              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 4.50              
Warrants and Rights Outstanding, Term (Year)   5 years              
[1] Derived from the audited consolidated financial statements as of and for the fiscal year ended March 28, 2020.