Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 62,988	$ 114,169
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	2,045,714	2,045,714
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	8,842,026	8,876,515
Common stock, shares outstanding	8,842,026	8,876,515