Note 3 - Long-term Borrowings (Details Textual) - USD ($) | Oct. 06, 2017 | Jul. 19, 2017 | Feb. 03, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 19, 2017 |
Proceeds from Issuance of Debt | | | | $ 1,050,000 | | |
Long-term Debt, Gross | | | | 2,042,000 | | |
Amortization of Debt Discount (Premium) | | | | 34,000 | $ 31,000 | |
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 | | | | 1,115,827 |
Class of Warrant or Right, Term | | 5 years | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | | $ 0.10 | | | | $ 0.10 |
Warrants and Rights Outstanding | | $ 167,000 | | | | $ 167,000 |
Warrants and Rights Outstanding, Incremental Value | | $ 6,000 | | | | $ 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 | | | | 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 | | | | 390,539 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | | $ 0.20 | | | | $ 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 | | | | 334,749 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | | $ 0.30 | | | | $ 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 | | | | 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 | | | | 268,625 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | | $ 0.10 | | | | $ 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 | | | | 268,625 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | | $ 0.20 | | | | $ 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 | | | | 230,250 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | | $ 0.30 | | | | $ 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, Mr Ikeda [Member] | | | | | | |
Debt Instrument, Face Amount | 300,000 | | | | | |
Notes Payable, Mr Berg [Member] | | | | | | |
Debt Instrument, Face Amount | 100,000 | | | | | |
Notes Payable to Mr Berg and Mr Ikeda [Member] | | | | | | |
Debt Instrument, Unamortized Discount | $ 191,000 | | | | | |
Amortization of Debt Discount (Premium) | | | | 10,000 | | |
Debt Instrument, Prepayment Penalty, Threshold Percentage | 95.00% | | | | | |
MHW SPV II, LLC [Member] | | | | | | |
Debt Agreement, Maximum Borrowing Capacity | | $ 2,000,000 | $ 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 | | | | 2,500,000 |
Debt Agreement, Post Amendment Period | | 60 days | | | | |
Debt Instrument, Prepayment Penalty in First Period, Percentage | | 4.00% | | | | |
Debt Instrument, Prepayment Penalty in Second Period, Percentage | | 2.00% | | | | |
Debt Instrument, Prepayment Penalty in Third Period, Percentage | | 1.00% | | | | |
MHW SPV II, LLC [Member] | Notes Payable, First Issuance [Member] | | | | | | |
Proceeds from Issuance of Debt | | | $ 945,000 | | | |
Debt Instrument, Term | | 5 years | | | | |
Long-term Debt, Gross | | $ 945,000 | | | | $ 945,000 |
Debt Instrument, Interest Rate, Stated Percentage | | 12.00% | | | | 12.00% |
Debt Instrument, Interest Rate, Stated Percentage, Paid in Cash | | 6.00% | | | | 6.00% |
Debt Instrument, Interest Rate, Stated Percentage, Paid in Kind | | 6.00% | | | | 6.00% |
Debt Instrument, Prepayment Penalty in First Period, Percentage | | 4.00% | | | | |
Debt Instrument, Prepayment Penalty in Second Period, Percentage | | 2.00% | | | | |
Debt Instrument, Prepayment Penalty in Third Period, Percentage | | 1.00% | | | | |
Debt Instrument, Unamortized Discount | | $ 93,000 | | | | $ 93,000 |
Amortization of Debt Discount (Premium) | | | | 26,000 | | 31,000 |
MHW SPV II, LLC [Member] | Notes Payable, Second Issuance [Member] | | | | | | |
Warrants and Rights Outstanding | | 115,000 | | | | 115,000 |
Debt Instrument, Unamortized Discount | | $ 98,000 | | | | $ 98,000 |
Amortization of Debt Discount (Premium) | | | | $ 10,000 | | |