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At December 31, 2020 and 2019, the fair values of cash, accounts receivable and accounts payable approximated their carrying values because of the short-term nature of these instruments (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Reported Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Line of credit and long-term debt | $ 33,445,446 | $ 30,987,918
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Line of credit and long-term debt | $ 33,445,446 | $ 30,987,918

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