CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income (loss)	$ (3,275,800)	$ (74,277)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Stock based compensation	505,188	399,779
Depreciation and amortization	315,456	365,076
Amortization of right-of-use assets	292,849	0
Provision (recovery) for accounts receivable allowances	264,808	(1,080)
Provision (recovery) for inventory reserves	18,988	(77,698)
Changes in operating assets and liabilities:
Accounts receivable	(1,574,778)	(530,014)
Inventories	468,340	(2,647,677)
Prepaid expense and other current assets	648,847	(305,739)
Operating lease liabilities	(318,183)	0
Accounts payable and accrued expenses	1,117,464	1,068,035
Net cash provided by (used in) operating activities	(1,536,821)	(1,803,595)
Investing activities:
Purchases of plant and equipment	(174,254)	(236,910)
Certification costs incurred and capitalized	(310,000)	(93,000)
Net cash provided by (used in) investing activities	(484,254)	(329,910)
Financing activities:
Proceeds from stock option exercise	60,648	379,257
Net proceeds from private placement offering	4,942,610	0
Net (payments to) proceeds from bank credit lines	(1,741,272)	1,651,012
Net cash provided by (used in) financing activities	3,261,986	2,030,269
Net change in cash	1,240,911	(103,236)
Cash, cash equivalents, and restricted cash - Beginning	125,982	229,218
Cash, cash equivalents, and restricted cash - Ending	1,366,893	125,982
Cash paid during the period for:
Interest	48,404	78,396
Income taxes	31,769	25,798
Cash is reported on the consolidated statements of cash flows as follows:
Cash and cash equivalents	1,216,893	125,982
Restricted cash	150,000	0
Total Cash	$ 1,366,893	$ 125,982