Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income (loss)	$ (980,387)	$ (1,943,628)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	391,181	389,487
Stock based compensation	170,074	164,795
Provision for accounts receivable allowances	540	8,988
Provision for inventory reserves	186,440	10,450
Changes in operating assets and liabilities:
Accounts receivable	393,164	(1,801,446)
Inventories	(566,490)	(1,454,910)
Prepaid expenses and other assets	(327,462)	(193,245)
Accounts payable and accrued expenses	1,421,963	1,084,228
Net cash provided by (used in) operating activities	689,023	(3,735,281)
Investing activities:
Cost of other assets	(75,000)	(295,000)
Additions to plant and equipment	(93,849)	(32,303)
Net cash provided by (used in) investing activities'	(168,849)	(327,303)
Financing activities:
Net funds received from (to) bank credit lines	(711,842)	2,141,799
Proceeds from stock option exercises	102,675	249,389
Net cash provided by (used in) financing activities	(609,167)	2,391,188
Net change in cash	(88,993)	(1,671,396)
Cash and cash equivalents at beginning of period	179,846	1,846,704
Cash and cash equivalents at end of period	90,853	175,308
Supplemental disclosures of cash flow information:
Cash paid during the period for: Interest	87,178	32,115
Cash paid during the period for: Income taxes	$ 14,123	$ 3,312