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Note 13 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Lease, Right-of-Use Asset | $ 16,296 |
Operating lease liability, current | 6,039 |
Operating lease liability, long-term | 10,713 |
Total operating lease liabilities | 16,752 |
Property, plant and equipment, gross | 165,896 | 163,804
Accumulated depreciation | (123,426) | (119,872)
Property, plant and equipment, net | 42,470 | $ 43,932
Other current liabilities | 97 |
Other long-term liabilities | 529 |
Total finance lease liabilities | 626 |
Assets under Finance Lease [Member] |  |
Property, plant and equipment, gross | 860 |
Accumulated depreciation | (225) |
Property, plant and equipment, net | $ 635 |

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