Note 12 - Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	$ (3,989)
Foreign currency translation	599
Unrealized losses
Pension remeasurement
Balance	(3,390)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(15)
Foreign currency translation
Unrealized losses	348
Pension remeasurement
Balance	333
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(1,543)
Foreign currency translation
Unrealized losses
Pension remeasurement	(34)
Balance	(1,577)
AOCI Attributable to Parent [Member]
Balance	(5,547)
Foreign currency translation	599
Unrealized losses	348
Pension remeasurement	(34)
Balance	(4,634)
AOCI Attributable to Noncontrolling Interest [Member]
Balance	(1,243)
Foreign currency translation
Unrealized losses
Pension remeasurement	(25)
Balance	(1,268)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(6,790)
Foreign currency translation	599
Unrealized losses	348
Pension remeasurement	(59)
Balance	$ (5,902)