Note 9 - Dividends and Dividend Equivalents (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Dividends Declared [Table Text Block]

	Year Ended December 31,
	2019		2018		2017
Dividend declared per share	$	1.60	$	1.20	$	0.80
Total amount	$	69,196	$	50,803	$	33,145