Note 17 - Retirement Plans (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2009	Dec. 31, 2014 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($)
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Common Stock, Shares Held in Employee Trust, Shares | shares		49,121	0	49,121
Deferred Compensation Liability, Current and Noncurrent		$ 932	$ 0	$ 932
Investment in Mutual Fund Under Plan		932		932
Common Stock, Shares Held in Employee Trust		1,062		1,062
Foreign Pension Plan [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year			0
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation		26,700	22,748	26,700
Defined Benefit Plan, Accumulated Benefit Obligation			21,764
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation		2,389	1,800	2,389
United States Pension Plan of US Entity [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year			$ 759
Defined Benefit Plan, Settlements, Plan Assets				17,847
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements				(7,170)
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation		23,160	$ 19,421	23,160
Defined Benefit Plan, Accumulated Benefit Obligation			58,556
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets			$ 19,421
Equity Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum			30.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum			80.00%
Fixed Income Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum			25.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum			45.00%
All Other Investments [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum			5.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum			15.00%
Number of Actuarial Equivalent Installments	10
Defined Benefit Plan, Settlements, Plan Assets				17,381
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements		$ (7,170)		(7,170)
Defined Contribution Plan, Cost Recognized			$ 1,081	$ 941	$ 731