Note 9 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Expected provision at federal statutory tax rate (21%)	$ (1,596,485)	$ (1,031,888)
Provision for valuation allowance	883,796	2,497,414
Foreign tax loss	70,492	57,856
Net operating loss carryback	(1,527,355)
State taxes, net of federal benefit	(36,832)	(11,506)
Federal research & development credit	(64,266)	(174,416)
Other permanent differences	743,295	76,448
Income (benefit) / tax expense	$ (1,527,355)	$ 1,413,908