Note 5 - Net Income (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Shares used in basic earnings per share calculation		40,788		40,275		40,723		39,143
Effect of dilutive securities:
Stock options		306		351		448		-
Restricted stock/Deferred stock units		-		-		-		-
Total effects of dilutive securities		306		351		448		-
Shares used in dilutive earnings per share calculation		41,094		40,626		41,171		39,143

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Anti-dilutive securities:
Stock options and warrants		48		211		70		2,334