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Note 4 - Long-term Borrowings (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 23, 2021
Oct. 06, 2017
Jul. 19, 2017
Feb. 03, 2015
Jul. 31, 2017
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Long-term Debt, Gross             $ 1,595,000   $ 1,595,000  
Amortization of Debt Discount (Premium)             61,000     $ 91,000
Gain (Loss) on Extinguishment of Debt, Total             $ (0)     896,000
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 (in shares)       1,115,827            
Class of Warrant or Right, Term (Year)       5 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 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 (in shares)       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 (in shares)       390,539            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 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 (in shares)       334,749            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 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 (in shares)       767,500            
Class of Warrant or Right, Term (Year)       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 (in shares)       268,625            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 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 (in shares)       268,625            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 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 (in shares)       230,250            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 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 (in shares)     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 (in shares)     498,981              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 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 (in shares)     273,981              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 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 (in shares)     181,269              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 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 (in shares)     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 (in shares)     166,327              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 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 (in shares)     91,327              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 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 (in shares)     60,423              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 0.30              
Warrants Issued in Connection with New Loans [Member]                    
Warrants and Rights Outstanding     $ 367,000              
Notes Payable, Mr Ikeda [Member]                    
Debt Instrument, Face Amount     300,000              
Repayments of Long-term Debt, Total   $ 264,000                
Notes Payable, Mr Berg [Member]                    
Debt Instrument, Face Amount     $ 100,000              
Debt Instrument, Prepayment Penalty, Threshold Percentage     95.00%              
Repayments of Long-term Debt, Total   88,000                
Notes Payable to Mr Berg and Mr Ikeda [Member]                    
Debt Instrument, Unamortized Discount, Total     $ 191,000              
Amortization of Debt Discount (Premium)   $ 46,000             40,000 40,000
Debt Instrument, Discount Percentage 12.00%             12.00%    
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)    
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 (Year)           5 years        
Long-term Debt, Gross           $ 945,000        
Debt Instrument, Interest Rate, Stated Percentage       12.00%            
Debt Instrument, Interest Rate, Stated Percentage, Paid in Cash       6.00%            
Debt Instrument, Interest Rate, Stated Percentage, Paid in Kind       6.00%            
Debt Instrument, Unamortized Discount, Total       $ 93,000            
Amortization of Debt Discount (Premium)                 19,000 19,000
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)                 $ 20,000 $ 20,000