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Note 16 - Earnings (Loss) Per Share - Common Stock (EPS) - Reconciliation of Numerator of Basic and Diluted EPS Calculations (Details) - USD ($)		3 Months Ended						9 Months Ended
	Sep. 23, 2015	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Net loss		$ (1,023,647)	$ (1,161,683)	$ (851,431)	$ (3,293,552)	$ (1,572,709)	$ (3,370,282)	$ (3,036,761)	$ (8,236,543)
Deemed dividend from trigger of anti-dilution provision feature	$ (41,688)	0			0			0	(112,686)
Net loss available to common stockholders		$ (1,023,647)			$ (3,293,552)			$ (3,036,761)	$ (8,349,229)

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- Definition

Amount of paid and unpaid paid-in-kind dividends (PIK) declared for classes of stock, for example, but not limited to, common and preferred.

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