Condensed Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net income (loss)	$ (1,926,231)	$ 406,208
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	185,821	181,136
Amortization of right-of-use assets	243,843	0
Stock based compensation	313,768	56,027
Provision for (recovery of) accounts receivable allowances	3,207	(1,750)
Provision for inventory reserves	23,957	0
Changes in operating assets and liabilities:
Accounts receivable	(794,418)	(416,640)
Inventories	1,151,227	(1,744,632)
Prepaid expenses and other assets	(713,641)	(170,551)
Operating lease liabilities	(269,177)	0
Accounts payable and accrued expenses	456,695	1,185,928
Net cash provided by (used in) operating activities	(1,324,949)	(504,274)
Investing activities:
Cost of other assets	(135,000)	(5,560)
Purchases of plant and equipment	(90,398)	(53,796)
Net cash provided by (used in) investing activities	(225,398)	(59,356)
Financing activities:
Net proceeds from (payments to) bank credit lines	(1,741,272)	100,804
Net proceeds from private placement offering	4,942,609	0
Proceeds from stock option exercises	13,850	351,108
Net cash provided by (used in) financing activities	3,215,187	451,912
Net change in cash	1,664,840	(111,718)
Cash and cash equivalents at beginning of period	125,982	229,218
Cash and cash equivalents at end of period	1,790,822	117,500
Supplemental disclosures of cash flow information:
Cash paid during the period for: Interest	48,405	11,712
Cash paid during the period for: Income taxes	$ 20,677	$ 18,956