Note 8 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 100,000	$ 400,000	$ 0
Income Tax Benefit, Forgiveness of Certain Inter-company Balances, Brazilian Subsidiary	(4,400,000)
Income Tax Benefit, Release of U.S.vTax Reserves	(2,200,000)
Income Tax Charge Increase in Valuation Allowance for Deferred Tax Assets	4,600,000
Income Tax Charge Carryback Losses	1,600,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	212,800,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	14,200,000
Deferred Tax Assets, Valuation Allowance	16,780,000	15,353,000
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	142,800,000	133,300,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 100,000	$ 400,000