Note 18 - Retirement Plans - Estimated Amounts That Will Be Amortized From AOCI Into Net Periodic Benefit Cost in Next Year (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
United States Pension Plan of US Entity [Member]
Actuarial loss	$ 798
Prior service cost/(benefit)
Total	798
Supplemental Employee Retirement Plan [Member]
Actuarial loss	241
Prior service cost/(benefit)	57
Total	298
Foreign Pension Plan [Member]
Actuarial loss	340
Prior service cost/(benefit)	(5)
Total	$ 335

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

Name:	us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration