Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Net loss	$ (1,700,003)	$ (2,022,761)
Adjustments to reconcile net income (loss) to net cash and cash equivalents used in operating activities:
Bad debt expense (recoveries)	350,086	(13,280)
Depreciation and amortization	545,717	658,255
Inventory write-down	90,083
Provision for product warranties	288,746	121,807
Stock based compensation	620,925	982,624
Decrease (increase) in:
Accounts receivable	(1,215,332)	(8,174,399)
Inventories	(1,698,523)	(661,419)
Prepaid and other current assets	483,306	(1,184,023)
Increase (decrease) in:
Accounts payable and accrued expenses	(676,564)	1,098,344
Deferred revenue	1,042,426	763,432
Product warranties	(237,509)	(132,311)
Total Adjustments	(406,639)	(6,540,970)
Net Cash Used In Operating Activities	(2,106,642)	(8,563,731)
Cash Flows from Investing Activities
Acquisition of property and equipment	(400,593)	(854,834)
Investment in debt securities - held to maturity	(7,797,217)	(2,892,190)
Investments matured	3,300,000	1,104,635
Net Cash Provided By (Used In) Investing Activities	(4,897,810)	(2,642,389)
Cash Flows from Financing Activities
Offering of common stock		17,249,995
Revolving credit facility, net		(2,214,970)
Offering costs		(1,402,336)
Withholding taxes on stock compensation	(118,754)	(118,648)
Exercise of warrants	2,739,238	90,867
Net Cash Provided By Financing Activities	2,620,484	13,604,908
Net Increase (Decrease) in Cash and Cash Equivalents	(4,383,968)	2,398,788
Cash and Cash Equivalents - Beginning	12,484,256	10,085,468
Cash and Cash Equivalents - Ending	8,100,288	12,484,256
Supplemental Disclosure of Cash Flow Information
Interest Paid		156,685
Non Cash Investing and Financing Activities
Transfer of inventory to property and equipment	240,137	203,987
Lease liabilities arising from obtaining right-of-use-assets	$ 1,714,814