Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Weighted Average Number of Shares [Table Text Block]

	Years ended December 31,
	2019		2018		2017
Weighted average shares outstanding – basic		107,329		109,375		109,987
Effect of common stock equivalents		978		1,053		1,062
Weighted average shares outstanding – diluted		108,307		110,428		111,049