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Note 6 - Commitments (Details Textual)
12 Months Ended
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Area of Real Estate Property | ft² 8,400    
Operating Leases, Rent Expense $ 151,748 $ 149,288 $ 146,092
Operating Leases, Future Minimum Payments, Due in Two Years 156,545    
Unrecorded Unconditional Purchase Obligation $ 79,000