Note 16 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 18,504
Operating lease liability, current	7,377
Operating lease liability, long-term	11,751
Total operating lease liabilities	19,128
Property, plant and equipment, gross	168,377	163,804
Accumulated depreciation	(126,434)	(119,872)
Property, plant and equipment, net	41,943	$ 43,932
Other current liabilities	121
Other long-term liabilities	512
Total finance lease liabilities	633
Assets under Finance Lease [Member]
Property, plant and equipment, gross	882
Accumulated depreciation	(262)
Property, plant and equipment, net	$ 620