UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ 544,901	$ 1,141,824			$ (1,994,461)	$ (1,384,997)
Net loss attributable to noncontrolling interest		(139,466)				(369,047)
Net income (loss) attributable to common stockholders	544,901	1,281,290	$ (2,539,363)	$ (2,297,240)	(1,994,461)	(1,015,950)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Net loss attributable to noncontrolling interest		(139,466)				(369,047)
Deferred benefit for income taxes					(567,257)	(649,288)
Loss on foreign currency transactions					18,647
(Gain) loss on disposal of property and equipment					(89,168)	60,642
Provision for bad debt	2,150	3,638			495	90,793
Impairment of goodwill					1,988,701		$ 0
Warranty reserves					3,982	2,496
Amortization of deferred gain					(45,316)	(111,859)
Depreciation and amortization					1,239,887	842,034
Inventory reserves					191,012	283,634
Amortization of debt discount	7,520	5,959			13,786	24,830
Stock-based compensation expense	164,857	214,846			490,140	374,979
Changes in operating assets and liabilities:
Accounts receivable					1,220,504	(2,487,103)
Inventories					(1,664,165)	(247,131)
Prepaid expenses and other current assets					(106,598)	(308,439)
Accounts payable					(60,607)	(1,534,530)
Accrued expenses and other liabilities					(251,235)	(91,026)
Net cash provided by (used in) operating activities					388,347	(5,134,965)
Cash flows from investing activities:
Cash acquired in merger						139,634
Cash paid in acquisition of CDI						(646,759)
Purchases of property and equipment, including capitalization of labor costs for test equipment and ERP					(2,061,762)	(80,474)
Proceeds from sales of property and equipment					1,050	34,450
Net cash used in investing activities					(2,060,712)	(553,149)
Cash flows from financing activities:
Proceeds from stock options exercised					29,149	64,454
Payment on working capital loan						(370,096)
Payment of payroll taxes on net issuance of employee stock options					(132,017)	(340,148)
Stock issuance costs					(212,566)	(1,810,902)
Proceeds from issuance of common stock					2,700,714	19,500,000
Net borrowings (repayments) on bank lines of credit					62,519	(3,334,508)
Net borrowings (repayments) on related-party notes payable					837,309	(163,483)
Net borrowings (repayments) on notes payable					374,623	(985,692)
Net cash provided by financing activities					3,659,731	12,559,625
Net change in cash and cash equivalents					1,987,366	6,871,511
Effect of exchange rates on cash					(33,421)
Cash and cash equivalents, beginning of period			$ 2,272,256	$ 185,717	2,272,256	185,717	185,717
Cash and cash equivalents, end of period	$ 4,226,201	$ 7,057,228			4,226,201	7,057,228	$ 2,272,256
Supplemental disclosure of cash flow information:
Cash paid during the period for interest					111,463	39,511
Cash paid during the period for income taxes					4,000	2,500
Supplemental disclosure of non-cash transactions:
Forward foreign currency contracts					53,904
Relative fair value of warrants issued in connection with notes and related-party notes payable					60,158
Reclassification of inventories to property and equipment					$ 67,948
Acquisition of CDI through issuance of common stock (Note 3)						4,194,673
Relative fair value of warrants issued in connection with initial public offering						669,408
Reclassification of prepaid IPO expenses to additional paid in capital						887,450
Disposal of obsolete inventory						947,400
Change in labor and overhead applied to inventory						$ 957,694