Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 173,603	$ 173,603
Common stock, authorized	40,000,000	40,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, issued	35,631,239	35,074,922
Common stock, outstanding	35,631,239	35,074,922