Note 9 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
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	$ (288)	$ (325)	$ (867)	$ (976)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Tax benefit		38		117
Amounts reclassified from accumulated other comprehensive loss		(70)		(216)
Interest expense, net		(108)		(333)
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	(14)	(13)	(39)	(39)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Total before tax	(302)	(338)	(906)	(1,015)
Tax benefit	100	108	300	324
Amounts reclassified from accumulated other comprehensive loss	(202)	(230)	(606)	(691)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amounts reclassified from accumulated other comprehensive loss	(202)	(300)	(606)	(907)
Selling, general and administrative expenses	14,950	13,989	42,602	41,818
Total before tax	19,164	17,206	71,160	58,263
Tax benefit	(5,443)	(5,330)	(21,784)	(18,569)
Amounts reclassified from accumulated other comprehensive loss	9,218	11,747	44,294	39,403
Interest expense, net	$ (366)	$ (517)	$ (357)	$ (1,467)