CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 3,003,135	$ 2,183,787	$ 4,084,403	$ 3,284,420
Cost of sales	1,196,531	753,931	1,500,226	1,074,997
Gross profit	1,806,604	1,429,856	2,584,177	2,209,423
Operating expenses:
Selling, general and administrative	1,229,435	1,192,708	2,239,910	2,192,848
Income from operations	577,169	237,148	344,267	16,575
Loss on currency exchange	(1,095)	(2,911)	(3,829)	(6,049)
Interest income	18,464	25,251	40,263	58,591
Gain on sale of assets	0	1,500	0	1,500
Income before taxes	594,538	260,988	380,701	70,617
Income tax expense	184,000	96,000	150,000	30,000
Net Income	$ 410,538	$ 164,988	$ 230,701	$ 40,617
Net income per share - basic (in dollars per share)	$ 0.09	$ 0.04	$ 0.05	$ 0.01
Net income per share - diluted (in dollars per share)	$ 0.09	$ 0.04	$ 0.05	$ 0.01
Weighted-average shares outstanding - basic (in shares)	4,468,630	4,511,965	4,477,545	4,511,965
Weighted-average shares outstanding - diluted (in shares)	4,468,630	4,511,965	4,477,545	4,511,965