CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 1,368,630	$ 1,081,268
Cost of sales	253,465	303,695
Gross profit	1,115,165	777,573
Operating expenses:
Selling, general and administrative	1,140,008	1,010,474
Loss from operations	(24,843)	(232,901)
Loss on currency exchange	0	(2,734)
Interest income	16,798	21,799
Loss before taxes	(8,045)	(213,836)
Income tax benefit	(16,000)	(34,000)
Net income (loss)	$ 7,955	$ (179,836)
Net income (loss) per share - basic (in dollars per share)	$ 0	$ (0.04)
Net income (loss) per share - diluted (in dollars per share)	$ 0	$ (0.04)
Weighted-average shares outstanding - basic (in shares)	4,496,494	4,486,559
Weighted-average shares outstanding - diluted (in shares)	4,504,503	4,486,559