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Note 6 - Commitments (Details Textual)
12 Months Ended
Dec. 31, 2015
USD ($)
ft²
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Area of Real Estate Property | ft² 8,400    
Operating Leases, Rent Expense $ 146,092 $ 117,084 $ 117,879
Operating Leases, Future Minimum Payments Due, Next Twelve Months 149,042    
Unrecorded Unconditional Purchase Obligation $ 72,500