Note 9 - Income Taxes (Details) - Effective Income Tax Reconciliation	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Reconciliation [Abstract]
Income tax expense at federal statuatory rate	35.00%	35.00%	35.00%
Nondeductible expenses	2.90%	4.30%	1.90%
Manufacturing deduction	(1.90%)	(2.50%)	(2.20%)
Different rates on earnings of foreign operations	(4.30%)	(4.60%)	(3.40%)
Change in valuation allowance	2.10%	3.00%	(2.10%)
Uncertain tax positions	0.60%	(0.80%)	1.90%
Foreign tax withholdings	0.40%	0.20%	5.20%
State tax expense, net	1.00%	0.50%	1.50%
Other	(1.60%)	0.20%	0.50%
Total income tax expense	34.20%	35.30%	38.30%