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Note 9 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) | 12 Months Ended
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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

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