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Note 8 - Commitments (Details Textual)
3 Months Ended
Mar. 31, 2019
USD ($)
ft²
Mar. 31, 2018
USD ($)
Area of Real Estate Property | ft² 8,400  
Operating Leases, Rent Expense, Total $ 40,316 $ 39,136
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 120,949  
Lessee, Operating Lease, Renewal Term 1 year  
Unrecorded Unconditional Purchase Obligation, Total $ 487,000