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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

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