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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 |

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