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Note 5 - Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 5. Property, Plant and Equipment Property, plant and equipment consisted of the following:
|  | As of |
|  | December 31, 2021 |  |  | December 31, 2020 |
Leasehold improvements |  | $ | 2,420,028 |  |  | $ | 2,420,028 |
Computer equipment |  |  | 511,062 |  |  |  | 532,125 |
Furniture and fixtures |  |  | 377,859 |  |  |  | 377,859 |
Operating lease right-of-use asset |  |  | 3,678,647 |  |  |  | 2,944,932 |
|  |  | 6,987,596 |  |  |  | 6,274,944 |
Less-accumulated depreciation |  |  | (4,621,639 | ) |  |  | (4,170,954 | )
Property, plant and equipment, net |  | $ | 2,365,957 |  |  | $ | 2,103,990 |
Depreciation and amortization expense on property, plant, and equipment was $0.5 million for each of the years ended December 31, 2021, 2020, and 2019.

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