Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Sale of Common Stock (Details Textual)

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Note 8 - Sale of Common Stock (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 11, 2020
Nov. 08, 2019
Nov. 07, 2019
Mar. 28, 2018
Jun. 29, 2019
Mar. 30, 2019
Jun. 27, 2020
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            
Stock Issued During Period, Value, New Issues $ 550,004            
Series E Preferred Stock [Member]                
Stock Issued During Period, Shares, New Issues (in shares)       42,800   56,200    
Shares Issued, Price Per Share (in dollars per share)       $ 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.