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Note 3 - Long-term Borrowings (Details Textual) - USD ($)				3 Months Ended
	Oct. 06, 2017	Jul. 19, 2017	Feb. 03, 2015	Mar. 31, 2018	Mar. 31, 2017
Amortization of Debt Discount (Premium)				$ 22,000	$ 10,000
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
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, Total	$ 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
Proceeds from Issuance of Debt		650,000
Debt Agreement, Maximum Borrowing Capacity During Post Amendment Period		$ 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
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, 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, Total		$ 93,000
Amortization of Debt Discount (Premium)				5,000	$ 8,000
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