Quarterly report pursuant to Section 13 or 15(d)

Note 15 - Preferred Stock and Warrants (Details Textual)

v3.20.2
Note 15 - Preferred Stock and Warrants (Details Textual)
12 Months Ended
Mar. 11, 2020
$ / shares
shares
Nov. 08, 2019
$ / shares
shares
Nov. 07, 2019
shares
Mar. 28, 2018
USD ($)
$ / shares
shares
Mar. 30, 2019
USD ($)
shares
Stock Issued During Period, Shares, New Issues (in shares) 146,668 699,333      
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 3.75 $ 3.75      
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    
Series E Preferred Stock [Member]          
Stock Issued During Period, Shares, New Issues (in shares)       42,800 56,200
Preferred Stock, Dividend Rate, Percentage       6.00%  
Issuance of Stock, Number of Investors       15  
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
Payments of Stock Issuance Costs | $         $ 212,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 25