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Note 7 - Common Stock Options (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Options				Exercise Price					Weighted-Average Exercise Price
Options outstanding at December 31, 2018			5,535,439			$2.50	-	$21.99			$	7.30
Granted			2,563,500			5.15	-	19.87				9.36
Exercised			(771,376	)		2.5	-	15				4.62
Forfeitures			(361,833	)		2.50	-	16.50				7.53
Options outstanding at December 31, 2019			6,965,730			$2.71	-	$21.99				6.09
Granted			230,500			8.89	-	21.80				16.85
Exercised			(1,784,763	)		2.71	-	19.09				6.08
Forfeitures			(84,042	)		4.26	-	21.80				8.55
Options outstanding at December 31, 2020			5,327,425			$2.71	-	$21.99				6.09
Granted			809,500			$11.35	-	$20.20				13.47
Exercised			(1,348,374	)		$3.27	-	$15.00				7.78
Forfeitures			(131,874	)		$4.14	-	$21.99				12.23
Options outstanding at December 31, 2021			4,656,677			$2.71	-	$21.74				10.68

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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