Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

	Years ended December 31 ,
	201 7		201 6		20 15
Weighted average shares outstanding – basic		109,987		112,474		115,677
Effect of common stock equivalents		1,062		887		1,051
Weighted average shares outstanding – diluted		111,049		113,361		116,728