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Note 3 - Long-term Borrowings (Details Textual) - USD ($)
12 Months Ended 19 Months Ended
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