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Note 8 - Commitments (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2019
ft²
Area of Real Estate Property | ft²         8,400
Operating Leases, Rent Expense, Total $ 40,316 $ 39,136 $ 120,949 $ 117,409  
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 40,316   40,316    
Unrecorded Unconditional Purchase Obligation, Total $ 391,000   $ 391,000