Note 9 - Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Selling, general and administrative expenses	$ 15,754	$ 14,045
Total before tax	26,927	21,397
Tax benefit	(5,812)	(6,552)
Amounts reclassified from accumulated other comprehensive loss	19,865	14,582
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amounts reclassified from accumulated other comprehensive loss	(244)	(202)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Cost of goods sold, selling, general, and administrative expenses	(346)	(289)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Selling, general and administrative expenses	(13)	(13)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Total before tax	(359)	(302)
Tax benefit	115	100
Amounts reclassified from accumulated other comprehensive loss	$ (244)	$ (202)