Note 3 - Recently-Adopted Accounting Pronouncements (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Lessee, Operating Lease, Term of Contract	4 years 30 days
Operating Lease, Right-of-Use Asset	$ 196,877
Operating Lease, Liability, Total	$ 198,518
Operating Lease, Weighted Average Remaining Lease Term	2 years
Operating Lease, Weighted Average Discount Rate, Percent	5.50%
Operating Lease, Expense	$ 52,244	$ 52,244
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 244,877
Operating Lease, Liability, Total			$ 242,696