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
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