Note 2 - Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax, Total			$ 6,300
Foreign Currency Transaction Gain (Loss), Realized			(370)	$ (1,231)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Assets, Total	$ 3,500		3,500
Disposal Group, Including Discontinued Operation, Liabilities, Total	$ 5,200		5,200
Restricted and Deferred Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	497,192	664,661
Other Expense [Member]
Foreign Currency Transaction Gain (Loss), Realized	$ (900)	$ (400)	$ (1,600)	$ (1,200)