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Note 6 - Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 6. Property and Equipment Property and equipment is stated at cost and consists of the following:
|  | December 31, |
|  | 20 20 |  |  | 201 9 |
Equipment and software |  | $ | 48,316 |  |  | $ | 42,733 |
Furniture and fixtures |  |  | 2,496 |  |  |  | 2,204 |
Leasehold improvements |  |  | 34,056 |  |  |  | 33,797 |
Construction in progress |  |  | 432 |  |  |  | 559 |
Subtotal |  |  | 85,300 |  |  |  | 79,293 |
Less accumulated depreciation |  |  | (34,687 | ) |  |  | (28,510 | )
Total |  | $ | 50,613 |  |  | $ | 50,783 |
Depreciation expense was $6.1 million, $5.0 million, and $4.9 million for the years ended December 31, 2020, 2019, and 2018, respectively.

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