Note 15 - Income Taxes - Income Tax Reconciliation (Details) - USD ($)		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Computed tax at Federal Statutory Rate, Amount		$ (215,976)	$ (450,780)
Computed tax at Federal Statutory Rate, percent		(21.00%)	(21.00%)
State and local income taxes, net of federal benefit, amount	[1]	$ (79,693)	$ (36,681)
State and local income taxes, net of federal benefit, percent	[1]	(7.75%)	(1.71%)
Foreign tax effects, amount		$ 0	$ 0
Foreign tax effects, percent		0.00%	0.00%
Effect of changes in tax laws/rates, amount		$ 0	$ 0
Effect of changes in tax laws/rates, percent		0.00%	0.00%
Effect of cross-border tax laws, amount		$ 0	$ 0
Effect of cross-border tax laws, percent		0.00%	0.00%
Research and experimental tax credits, amount		$ (58,901)	$ (116,091)
Research and experimental tax credits, percent		(5.73%)	(5.41%)
Changes in valuation allowance, amount		$ 332,646	$ 559,959
Changes in valuation allowance, percent		32.34%	26.09%
Nontaxable/nondeductible items, amount		$ 5,280	$ 4,619
Nontaxable/nondeductible items, percent		0.51%	0.22%
Share-based compensation, amount		$ 28,214	$ 49,030
Share-based compensation, percent		2.75%	2.28%
Changes in unrecognized tax benefits		$ 0	$ 0
Changes in unrecognized tax benefits, percent		0.00%	0.00%
Income tax expense		$ 11,570	$ 10,056
Income tax expense, percent		1.12%	0.47%

[1] State taxes in California, New York, Pennsylvania, and Minnesota made up the majority of the tax effect in this category.