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Note 7 - Commitments and Contingencies (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Rent Expense   $ 253,000
Purchase Obligation $ 500,000  
Selling, General and Administrative Expenses [Member]    
Operating Leases, Rent Expense 300,000 500,000
Cost of Sales [Member]    
Operating Leases, Rent Expense $ 700,000 $ 400,000
Maximum [Member]    
Lessee, Operating Lease, Term of Contract 5 years