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Note 3 - Long-term Borrowings (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 19, 2017
Feb. 03, 2015
Jul. 31, 2017
Jul. 30, 2017
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Instrument, Unamortized Discount, Total                 $ 22,000
Amortization of Debt Discount (Premium)             $ 22,000 $ 38,000  
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 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                
Notes Payable to Mr Berg and Mr Ikeda [Member]                  
Amortization of Debt Discount (Premium)         $ 5,000 $ 5,000 10,000 10,000  
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   267,000   267,000    
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)         5,000        
Accrued in-kind interest – long term         $ 182,000   182,000    
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)           $ 5,000 $ 9,000 $ 9,000