Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income (loss)	$ (751,879)	$ (1,121,118)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	59,399	78,203
Amortization of right-of-use assets	25,082	120,902
Stock based compensation	127,053	175,012
Provision for (recovery of) accounts receivable allowances	(4,203)	1,943
Provision for inventory reserves	0	23,957
Changes in operating assets and liabilities:
Accounts receivable	(1,872,088)	(430,021)
Inventories	3,261,616	1,421,071
Prepaid expenses and other assets	32,368	312,542
Operating lease liabilities	(25,082)	(129,831)
Accounts payable and accrued expenses	(2,193,488)	(713,268)
Net cash provided by (used in) operating activities	(1,341,222)	(260,608)
Investing activities:
Certification costs incurred and capitalized	(20,000)	(135,000)
Purchases of plant and equipment	(13,016)	0
Net cash provided by (used in) investing activities	(33,016)	(135,000)
Financing activities:
Net proceeds from (payments to) bank credit lines	387,298	380,112
Proceeds from stock option exercises	197,658	5,100
Net cash provided by (used in) financing activities	584,956	385,212
Net change in cash	(789,282)	(10,396)
Cash, cash equivalents, and restricted cash at beginning of period	1,366,893	125,982
Cash and cash equivalents at end of period	577,611	115,586
Supplemental disclosures of cash flow information:
Cash paid during the period for: Interest	5,712	32,217
Cash paid during the period for: Income taxes	6,316	7,788
Total Cash	$ 577,611	$ 125,982