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Note 7 - Property, Plant and Equipment, Net | 6 Months Ended
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Jun. 30, 2023
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 7. Property, plant and equipment, net Property, plant and equipment, net, consisted of the following (in thousands):
|  | Useful Life |  |  |  |  |  |  |  |  |
Asset Class |  | (Years) |  |  | June 30, 2023 |  |  | December 31, 2022 |
Operational equipment |  |  | 3 - 10 |  |  | $ | 4,501 |  |  | $ | 1,445 |
Lab equipment |  |  | 5 |  |  |  | 730 |  |  |  | 730 |
Computer equipment |  |  | 3 |  |  |  | 6 |  |  |  | 6 |
Office furniture and equipment |  |  | 3 |  |  |  | 90 |  |  |  | 90 |
Leasehold improvements |  |  | 2.5 |  |  |  | 80 |  |  |  | 80 |
Land |  |  | - |  |  |  | 1,141 |  |  |  | — |
Building |  |  | 39 |  |  |  | 3,131 |  |  |  | — |
Equipment under construction |  |  |  |  |  |  | 3,789 |  |  |  | 6,486 |
|  |  |  |  |  |  | 13,468 |  |  |  | 8,837 |
Less: accumulated depreciation |  |  |  |  |  |  | (1,517 | ) |  |  | (1,494 | )
Total property, plant and equipment, net |  |  |  |  |  | $ | 11,951 |  |  | $ | 7,343 |
Property, plant and equipment depreciation expense was $0.2 million and $0.3 million for the three and six months ended June 30, 2023 and $0.1 million and $0.2 million three and six months ended June 30, 2022, respectively. Equipment under construction is comprised of various components being manufactured or installed by the Company.

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