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Note 3 - Long-term Borrowings (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 19, 2022
Jun. 23, 2021
Oct. 06, 2017
Jul. 19, 2017
Feb. 03, 2015
Jul. 31, 2017
Jul. 30, 2017
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument, Unamortized Discount, Total                   $ 22,000
Amortization of Debt Discount (Premium)                 $ 22,000 61,000
Repayments of Long-Term Debt, Total                 2,045,000 352,000
Proceeds from Warrant Exercises                 367,000 0
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, First Issuance [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       1,115,827            
Class of Warrant or Right, Term       5 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.10            
Warrants and Rights Outstanding       $ 167,000            
Warrants and Rights Outstanding, Incremental Value       $ 6,000            
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, First Issuance, Tranche 1 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       390,539            
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, First Issuance, Tranche 2 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       390,539            
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.20            
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, First Issuance, Tranche 3 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       334,749            
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.30            
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, Second Issuance [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       767,500            
Class of Warrant or Right, Term       5 years            
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, Second Issuance, Tranche 1 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       268,625            
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.10            
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, Second Issuance, Tranche 2 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       268,625            
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.20            
Warrants Issued to MHW SPV II, LLC in Connection with Promissory Note, Second Issuance, Tranche 3 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       230,250            
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.30            
Warrants Issued to Mr Ikeda in Connection With Notes Payable Mr Ikeda [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     954,231              
Warrants Issued to Mr Ikeda in Connection With Notes Payable Mr Ikeda Tranche 1 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     498,981              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.10              
Warrants Issued to Mr Ikeda in Connection With Notes Payable Mr Ikeda Tanche 2 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     273,981              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.20              
Warrants Issued to Mr Ikeda in Connection With Notes Payable Mr Ikeda Tranche 3 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     181,269              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.30              
Warrants Issued to Mr Berg in Connection with Notes Payable [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     318,077              
Warrants Issued to Mr Berg in Connection with Notes Payable, Tranche 1 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     166,327              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.10              
Warrants Issued to Mr Berg in Connection with Notes Payable, Tranche 2 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     91,327              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.20              
Warrants Issued to Mr Berg in Connection with Notes Payable, Tanche 3 [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     60,423              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.30              
Warrants Issued in Connection with New Loans [Member]                    
Warrants and Rights Outstanding     $ 367,000              
Notes Payable to Mr Berg and Mr Ikeda [Member]                    
Debt Instrument, Unamortized Discount, Total     191,000              
Amortization of Debt Discount (Premium)                   40,000
Debt Instrument, Discount Percentage               12.00%    
Warrants Issued to MHW and MHW Partners in Connection With Term Loan Agreements [Member]                    
Stock Issued During Period, Shares, Warrants Exercised 1,883,326                  
Proceeds from Warrant Exercises $ 367,000                  
Notes Payable to Mr Berg and Mr Ikeda [Member]                    
Amortization of Debt Discount (Premium)   $ 46,000             10,000  
Amortization of Debt Issuance Costs   2,000                
Notes Payable to Mr Berg and Mr Ikeda [Member] | Interest Expense [Member]                    
Gain (Loss) on Extinguishment of Debt, Total               $ 470    
Notes Payable, Mr Berg [Member]                    
Amortization of Debt Discount (Premium)                   20,000
Debt Instrument, Face Amount     $ 100,000              
Debt Instrument, Prepayment Penalty, Threshold Percentage     95.00%              
Repayments of Long-Term Debt, Total   88,000                
Notes Payable, Mr Ikeda [Member]                    
Debt Instrument, Face Amount     $ 300,000              
Repayments of Long-Term Debt, Total   $ 264,000                
MHW SPV II, LLC [Member]                    
Debt Agreement, Maximum Borrowing Capacity         $ 2,000,000 $ 2,000,000        
Proceeds from Issuance of Debt       $ 650,000            
Debt Agreement, Maximum Borrowing Capacity During Post Amendment Period           $ 2,500,000        
Debt Agreement, Post Amendment Period (Day)           60 days        
MHW SPV II, LLC [Member] | Notes Payable, First Issuance [Member]                    
Proceeds from Issuance of Debt         $ 945,000          
Debt Instrument, Term             5 years      
Notes Payable due July, 2022           $ 945,000        
Debt Instrument, Interest Rate, Stated Percentage       12.00%            
Debt Instrument, Interest Rate, Stated Percentage, Paid in Cash       6.00%            
Debt Instrument, Unamortized Discount, Total       $ 93,000            
Amortization of Debt Discount (Premium)                 $ 9,000  
MHW SPV II, LLC [Member] | Notes Payable, Second Issuance [Member]                    
Warrants and Rights Outstanding       115,000            
Debt Instrument, Unamortized Discount, Total       $ 98,000            
Amortization of Debt Discount (Premium)                   $ 19,000