STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities
Net loss	$ (346,448)	$ (237,267)
Adjustments to reconcile net income (loss) to net cash and cash equivalents used in operating activities:
Depreciation and amortization	337,583	315,599
Provision for product warranties	32,877	34,500
Stock based compensation	726,377	6,477
(Increase) decrease in:
Accounts receivable	(1,027,063)	(1,663,980)
Inventories	(323,962)	(288,391)
Prepaids and other current assets	(777,614)	(334,095)
Increase (decrease) in:
Accounts payable and accrued expenses	633,956	1,226,425
Deferred revenue	(65,971)	(364,860)
Product warranties	(40,759)	(33,751)
Total Adjustments	(504,576)	(1,102,076)
Net Cash Used In Operating Activities	(851,024)	(1,339,343)
Cash Flows from Investing Activities
Acquisition of property and equipment	(285,998)	(196,190)
Investment in debt securities - held to maturity	(7,865,675)
Investments matured during the year	299,533
Net Cash Used In Investing Activities	(7,852,140)	(196,190)
Cash Flows from Financing Activities
Offering of shares	12,650,000	2,200,000
Revolving credit facility, net	(422,702)	47,702
Exercise of warrants and options	1,132,538
Offering costs	(2,126,562)	(185,814)
Cash dividends on preferred stock	(2,552,701)
Net Cash Provided By Financing Activities	8,680,573	2,061,888
Net Decrease in Cash and Cash Equivalents	(22,591)	526,355
Cash and Cash Equivalents - Beginning	5,065,068	4,538,713
Cash and Cash Equivalents - Ending	5,042,477	5,065,068
Supplemental Disclosure of Cash Flow Information
Interest Paid	23,773	17,814
Non Cash Investing and Financing Activities
Reclassification of prepaid offering costs to APIC	130,629
Transfer of inventory units to property and equipment	$ 67,908	$ 83,224