Note 13 - Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	$ (110)	$ (3,989)
Foreign currency translation	(3,879)	(579)
Reclassification to operations	0	0
Unrealized losses	0	0
Pension remeasurement	0	0
Tax provision	0
Balance	(3,989)	(4,568)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	0	(15)
Foreign currency translation	0	0
Reclassification to operations	13	(433)
Unrealized losses	53	923
Pension remeasurement	0	0
Tax provision	(81)
Balance	(15)	475
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(292)	(1,543)
Foreign currency translation	0	0
Reclassification to operations	0	0
Unrealized losses	0	0
Pension remeasurement	(1,251)	(386)
Tax provision	0
Balance	(1,543)	(1,929)
AOCI Attributable to Parent [Member]
Balance	(402)	(5,547)
Foreign currency translation	(3,879)	(579)
Reclassification to operations	13	(433)
Unrealized losses	53	923
Pension remeasurement	(1,251)	(386)
Tax provision	(81)
Balance	(5,547)	(6,022)
AOCI Attributable to Noncontrolling Interest [Member]
Balance	(248)	(1,243)
Foreign currency translation	0	0
Reclassification to operations	0	0
Unrealized losses	0	0
Pension remeasurement	(995)	(354)
Tax provision	0
Balance	(1,243)	(1,597)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(650)	(6,790)
Foreign currency translation	(3,879)	(579)
Reclassification to operations	13	(433)
Unrealized losses	53	923
Pension remeasurement	(2,246)	(740)
Tax provision	(81)
Balance	$ (6,790)	$ (7,619)