Note 18 - Foreign Operations and Sales (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	Domestic		Foreign		Total
2017
Gross sales	$	312,895	$	213,041	$	525,936
Long-lived assets		143,540		168,253		311,793
2016
Gross sales	$	270,773	$	220,765	$	491,538
Long-lived assets		136,692		135,523		272,215
2015
Gross sales	$	237,146	$	196,710	$	433,856
Long-lived assets		93,142		132,099		225,241

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	2017		2016		2015
Europe	$	327,309	$	321,525	$	280,593
North America		170,490		138,328		127,024
Asia		17,625		17,996		14,024
Other		10,512		13,689		12,215
Total	$	525,936	$	491,538	$	433,856