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Note 3 - Long-term Borrowings (Details Textual) - USD ($)				1 Months Ended	3 Months Ended
	Oct. 06, 2017	Jul. 19, 2017	Feb. 03, 2015	Jul. 31, 2017	Mar. 31, 2020	Mar. 31, 2019
Amortization of Debt Discount (Premium)					$ 23,000	$ 14,000
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
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	100,000
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 (Day)				60 days
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 (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, Prepayment Penalty in Third Period, Percentage		1.00%
Debt Instrument, Unamortized Discount, Total		$ 93,000
Amortization of Debt Discount (Premium)					5,000	5,000
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	$ 5,000