Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Summary Of Significant Accounting Policies Narrative
Allowance for accounts receivable	$ 1,369		$ 742
Cash	5,994,243		10,538
FDIC insured limit	250,000
Depreciation expenses	10,577	$ 10,175
Deferred revenue and customer deposit	921,092		$ 841,290
Research and development costs	0	0
Advertising costs	$ 21,143	$ 65,428