Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands |
Mar. 31, 2020 |
Dec. 31, 2019 |
---|---|---|
Property, plant and equipment, net | $ 146,012 | $ 134,591 |
Computer Equipment [Member] | ||
Property, plant and equipment, gross | 487 | 487 |
Furniture and Fixtures [Member] | ||
Property, plant and equipment, gross | 464 | 471 |
Leasehold Improvements [Member] | ||
Property, plant and equipment, gross | 429 | 547 |
Excluding Construction in Progress [Member] | ||
Property, plant and equipment, gross | 1,380 | 1,505 |
Less: accumulated depreciation | (808) | (793) |
Property, plant and equipment, net | 572 | 712 |
Construction in Progress [Member] | ||
Property, plant and equipment, gross | 145,440 | 133,879 |
Construction in Progress [Member] | Rio Grande [Member] | ||
Property, plant and equipment, gross | 132,339 | 121,081 |
Construction in Progress [Member] | Rio Bravo [Member] | ||
Property, plant and equipment, gross | $ 13,101 | $ 12,798 |