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Note 8 - Commitments (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
ft²
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
ft²
Jun. 30, 2018
USD ($)
Area of Real Estate Property | ft² 8,400   8,400  
Operating Leases, Rent Expense, Total $ 40,316 $ 39,136 $ 80,633 $ 78,273
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 80,633   $ 80,633  
Lessee, Operating Lease, Renewal Term 1 year   1 year  
Unrecorded Unconditional Purchase Obligation, Total $ 459,000   $ 459,000