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Note 11 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 06, 2017
Equity Method Investment, Ownership Percentage 50.00%    
Operating Leases, Rent Expense   $ 253,000  
Interest Paid, Net $ 273,000 314,000  
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
Notes Payable, Other Payables [Member]      
Debt Instrument, Unamortized Discount 386,000 120,000  
MHW SPV II, LLC [Member] | Notes Payable, Other Payables [Member]      
Notes Payable, Related Parties 945,000    
Debt Instrument, Unamortized Discount 84,000    
Interest Paid, Net 114,000 $ 114,000  
MHW Partners [Member] | Notes Payable, Other Payables [Member]      
Notes Payable, Related Parties 650,000    
Debt Instrument, Unamortized Discount 88,000    
Interest Paid, Net $ 36,000    
Mr. Glen Ikeda [Member] | 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    
Mr. Glen Ikeda [Member] | Notes Payable, Other Payables [Member]      
Notes Payable, Related Parties $ 300,000    
Debt Instrument, Interest Rate, Stated Percentage 0.00%