Note 8 - Stock Repurchase Program (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Text Block [Abstract]

Schedule of Repurchase Agreements [Table Text Block]

	Shares Repurchased		Average Price Per Share		Total Amount
Cumulative balance at January 1, 2013		-	$	-	$	-
Repurchases		664	$	31.06		20,615
Cumulative balance at December 31, 2013		664	$	31.06		20,615
Repurchases		1,051	$	39.19		41,198
Cumulative balance at December 31, 2014		1,715	$	36.04		61,813
Repurchases		645	$	50.05		32,286
Cumulative balance at December 31, 2015		2,360	$	39.87	$	94,099