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) - USD ($)
 9 Months Ended 12 Months Ended
Jun. 06, 2021
Nov. 07, 2019
Mar. 26, 2018
Dec. 25, 2021
Mar. 30, 2019
Mar. 27, 2021
Stock Issued During Period, Shares, New Issues (in shares) 46,154          
Shares Issued, Price Per Share (in dollars per share) $ 3.25          
Conversion of Series E Preferred Stock into Common Stock [Member]            
Conversion of Stock, Shares Issued (in shares)   896,636   35,000    
Conversion of Stock, Shares Converted (in shares)   88,600   3,500    
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%      
Proceeds from Issuance of Preferred Stock and Preference Stock     $ 1,100,000   $ 1,405,000  
Proceeds from Issuance of Preferred Stock and Preference Stock, Net of Issuance Costs     $ 1,000,000.0   1,200,000  
Payments of Stock Issuance Costs         $ 212,000  
Shares Issued, Price Per Share (in dollars per share)     $ 25.00      
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       5,700   9,200
Preferred Stock, Liquidation Preference, Value       $ 214,000   $ 345,000