Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Expected provision at federal statutory tax rate (21% and 34%, respectively)	$ (1,167,092)	$ 2,446,421
Foreign tax loss	99,215	293,589
Adjustment to 2017 tax return	58,304
State taxes, net of federal benefit	80,367	11,580
Stock-based compensation expense	185,675	(161,429)
Net operating loss carryforward		7,280
Federal research & development credit	(83,245)	(781,760)
Other permanent differences	470,214	118,263
Income tax expense/(benefit)	$ (356,562)	$ 1,933,944