Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Sale of Common Stock and Prefunded Warrants (Details Textual)

v3.22.0.1
Note 8 - Sale of Common Stock and Prefunded Warrants (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 06, 2021
Apr. 27, 2021
Sep. 25, 2021
Jun. 26, 2021
Dec. 25, 2021
Dec. 26, 2020
Proceeds from Issuance of Warrants         $ 1,500,000 $ 0
Dividends, Common Stock, Total       $ 203,000    
Warrant Issuance Cost         157,000 0
Fair Value Adjustment of Warrants         (92,000) 0
Stock Issued During Period, Shares, New Issues (in shares) 46,154          
Shares Issued, Price Per Share (in dollars per share) $ 3.25          
Proceeds from Issuance of Common Stock $ 150,000       $ 145,000 $ 0
Proceeds from Issuance of Common Stock, Net $ 145,000          
Prefunded Warrants [Member] | Measurement Input, Exercise Price [Member] | Minimum [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.01        
Private Placement [Member] | Prefunded Warrants [Member]            
Class of Warrant or Right, Number of Warrants Issued (in shares)   461,538        
Proceeds from Issuance of Warrants   $ 1,500,000        
Class of Warrant or Right, Price Per Warrant (in dollars per share)   $ 3.25        
Proceeds from Issuance of Warrants, Net   $ 1,343,000        
Class of Warrant or Right, Maximum Common Stock Ownership Percentage After The Exercise   9.99%        
Derivative Liability, Total   $ 1,703,000        
Dividends, Common Stock, Total   203,000        
Warrant Issuance Cost   $ 157,000        
Fair Value Adjustment of Warrants     $ (46,000) $ (46,000)    
Private Placement [Member] | Placement Agent Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 3.575        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   23,076