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Note 4 - Property and Equipment and Building Construction in Progress | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 4. Property and Equipment and Building Construction in Progress Property and equipment consisted of the following as of December 31, 2021 and 2020 (in thousands):
|  | 2021 |  |  | 2020 |
Computer and office equipment |  | $ | 557 |  |  | $ | 557 |
Furniture and fixtures |  |  | 130 |  |  |  | 130 |
Land |  |  | 1,418 |  |  |  | 1,418 |
Scientific equipment |  |  | 16,829 |  |  |  | 14,433 |
Vehicle |  |  | 82 |  |  |  | 82 |
Building |  |  | 22,773 |  |  |  | 21,013 |
Mobile facility |  |  | 189 |  |  |  | 189 |
Construction in process |  |  | 2,061 |  |  |  | 2,625 |
Accumulated depreciation |  |  | (15,731 | ) |  |  | (13,111 | )
|  | $ | 28,308 |  |  | $ | 27,336 |
Depreciation expenses related to property and equipment amounted to approximately $2.6 million, $2.2 million, and $2.4 million for the years ended December 31, 2021, 2020 and 2019, respectively. Construction in process is related to research and development and manufactory equipment. Depreciation expense is recorded to cost of goods sold, research and development and general and administrative expense line items on the Consolidated Statements of Operations (in thousands).

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