Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash	$ 1,728,200	$ 1,362,800
Accounts receivable less $12,000 allowance for doubtful accounts	1,167,600	1,280,800
Inventory	384,700	324,800
Prepaid and other	63,600	97,800
Total current assets	3,344,100	3,066,200
Fixed assets
Leasehold improvements	27,800	27,800
Furniture, fixtures and equipment	163,700	163,700
Fixed assets, gross	191,500	191,500
Less: accumulated depreciation and amortization	110,400	104,300
Total fixed assets	81,100	87,200
Other assets
Long-term receivables	465,300	559,500
Operating lease right of use - building	149,400	160,300
Other assets	614,700	719,800
Total assets	4,039,900	3,873,200
Current liabilities
Accounts payable	52,600	5,700
Accrued expenses	193,800	178,600
Income taxes	43,600	36,300
Operating lease liability - current	45,200	44,500
Total current liabilities	335,200	265,100
Other liabilities
Accrued expenses, non-current	32,600	39,200
Operating lease liability - non-current	104,200	115,800
Total other liabilities	136,800	155,000
Stockholders' equity
Common stock, $0.01 par value Authorized - 75,000,000 shares, Issued and outstanding - 67,353,690 shares	673,500	673,500
Paid-in capital	12,575,800	12,575,800
Accumulated deficit	(9,681,400)	(9,796,200)
Total stockholders' equity	3,567,900	3,453,100
Total liabilities and stockholders' equity	$ 4,039,900	$ 3,873,200