Annual report pursuant to Section 13 and 15(d)

Note 19 - Subsequent Events (Details Textual)

v3.21.2
Note 19 - Subsequent Events (Details Textual) - USD ($)
12 Months Ended
Jun. 04, 2021
Apr. 27, 2021
Mar. 11, 2020
Nov. 07, 2019
Mar. 28, 2020
Mar. 30, 2019
Mar. 27, 2021
Mar. 26, 2018
Stock Issued During Period, Shares, New Issues (in shares)     146,668          
Shares Issued, Price Per Share (in dollars per share)     $ 3.75          
Stock Issued During Period, Value, New Issues     $ 550,004   $ 2,564,000      
Series E Preferred Stock [Member]                
Stock Issued During Period, Shares, New Issues (in shares)           56,200    
Shares Issued, Price Per Share (in dollars per share)           $ 25   $ 25
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         9,200   9,200  
Conversion of Series E Preferred Stock into Common Stock [Member]                
Conversion of Stock, Shares Issued (in shares)       896,636        
Conversion of Stock, Shares Converted (in shares)       88,600        
Subsequent Event [Member] | Series E Preferred Stock [Member]                
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 5,700              
Subsequent Event [Member] | Conversion of Series E Preferred Stock into Common Stock [Member]                
Conversion of Stock, Shares Issued (in shares) 35,000              
Conversion of Stock, Shares Converted (in shares) 3,500              
Private Placement [Member] | Subsequent Event [Member]                
Stock Issued During Period, Shares, New Issues (in shares) 45,153              
Shares Issued, Price Per Share (in dollars per share) $ 3.25              
Stock Issued During Period, Value, New Issues $ 150,000              
Private Placement [Member] | Prefunded Warrants [Member] | Subsequent Event [Member]                
Class of Warrant or Right, Number of Warrants Issued (in shares)   461,538            
Class of Warrant or Right, Price Per Warrant (in dollars per share)   $ 3.25            
Proceeds from Issuance of Warrants   $ 1,500,000            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1            
Class of Warrant or Right, Maximum Common Stock Ownership Percentage After The Exercise   9.99%