Note 8 - Effective Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income tax expense (benefit) at federal statuatory rate	(35.00%)	35.00%	35.00%
Nondeductible expenses	2.80%	2.90%	4.30%
Goodwill impairment	15.70%
Manufacturing deduction	1.80%	(1.90%)	(2.50%)
Different rates on earnings of foreign operations	(3.60%)	(4.30%)	(4.60%)
Change in valuation allowance	2.80%	2.10%	3.00%
Uncertain tax positions	(2.20%)	0.60%	(0.80%)
State tax expense (benefit), net	(1.50%)	1.00%	0.50%
Other	0.10%	(1.20%)	0.40%
Total income tax expense (benefit)	(19.10%)	34.20%	35.30%