Note 9 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Expected provision at federal statutory tax rate (21%)	$ 1,002,721	$ (1,596,485)
Provision for valuation allowance	(346,209)	883,796
Foreign tax (income) loss	(115,863)	70,492
Net operating loss carryback	0	(1,527,355)
State taxes, net of federal benefit	5,787	(36,832)
Federal research & development credit	(56,761)	(64,266)
Other permanent differences	51,820	743,295
Income (benefit) / tax expense	28,377	(1,527,355)
Paycheck Protection Program CARES Act [Member]
PPP loan forgiveness	$ (513,118)	$ 0