Schedule of Valuation and Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 380,212	$ 398,847
Additions Charged to Cost and Expenses	(29,411)	(14,535)
Deductions	(227,187)	(4,100)
Balance at the End of Year	123,614	380,212
SEC Schedule, 12-09, Reserve, Inventory [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	3,895,451	4,460,811
Additions Charged to Cost and Expenses	126,616	(351,925)
Deductions	(946,547)	(213,435)
Balance at the End of Year	$ 3,075,520	$ 3,895,451