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Note 9 - Commitments (Details Textual)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
ft²
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
ft²
Jun. 30, 2019
USD ($)
Area of Real Estate Property (Square Foot) | ft² 8,400   8,400  
Operating Leases, Rent Expense, Total $ 41,539 $ 40,316 $ 83,078 $ 80,633
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year 83,078   83,078  
Lessee, Operating Lease, Liability, to be Paid, Year One 171,213   171,213  
Lessee, Operating Lease, Liability, to be Paid, Year Two 176,356   176,356  
Unrecorded Unconditional Purchase Obligation, Total 400,834   400,834  
Purchase Obligation, to be Paid, Remainder of Fiscal Year 338,334   338,334  
Purchase Obligation, to be Paid, Year One $ 62,500   $ 62,500