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PROPERTY, PLANT, AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
PROPERTY, PLANT, AND EQUIPMENT |
PROPERTY, PLANT, AND EQUIPMENT | 5. PROPERTY, PLANT, AND EQUIPMENT Property, plant, and equipment consist of the following:
|  | December 31,
|  | 2020 |  | 2019
Land |  | $ | 261,893 |  | $ | 261,893
Buildings and building improvements |  |  | 11,593,952 |  |  | 11,566,115
Production equipment |  |  | 20,290,331 |  |  | 19,903,236
Office furniture and equipment |  |  | 3,630,455 |  |  | 3,527,577
Construction in progress |  |  | 21,365,915 |  |  | 765,176
|  |  | 57,142,546 |  |  | 36,023,997
Accumulated depreciation |  |  | (26,326,042) |  |  | (25,391,940)
|  | $ | 30,816,504 |  | $ | 10,632,057
Depreciation expense for the years ended December 31, 2020, 2019, and 2018 was $832,069; $851,673; and $883,610, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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