Note 10 - Per Share Data (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended March 31,
	2020			2019
Net (loss)/income for basic earnings per share	$	(8,897,529	)	$	1,629,777
Less: Change in fair value of warrants		—			(3,136,265	)
Net (loss)/income, adjusted for change in fair value of warrants for diluted earnings per share	$	(8,897,529	)	$	(1,506,488	)
Weighted-average shares		81,240,105			80,913,320
Effect of potential common shares		—			1,225,788
Weighted-average shares: diluted		81,240,105			82,139,108
(Loss)/income per share: basic	$	(0.11	)	$	0.02
(Loss) per share: diluted	$	(0.11	)	$	(0.02	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended March 31,
	2020		2019
Stock options		280,835		377,011
Stock-settled stock appreciation rights		—		6,756
Restricted stock units		236,848		509,411
Warrants		1,547,296		—