Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net loss	$ (444,357)	$ (1,903,341)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	583,824	810,442
Stock-based compensation	21,224	23,627
Non-cash life insurance policy reduction (accretion)		20,329
Non-cash other revenue	(345,732)
Non-cash miscellaneous loss	24,618
(Gain) loss on sale of property, plant and equipment	(434,549)	695
Foreign currency transaction (gain)/loss	11,450	(32,577)
(Increase) decrease in trade, accounts & notes receivable, and deposits - related parties	(644,823)	(377,466)
(Increase) decrease in inventories	843,881	(26,036)
(Increase) decrease in refundable income taxes	306	(3,840)
(Increase) decrease in prepaid expenses and other current assets	142,614	(75,941)
Increase (decrease) in income taxes payable	82,833	30,909
Increase (decrease) in accounts payable & accrued expenses, deferred revenue, and non-current liabilities	(783,880)	363,275
Net cash used in operating activities	(942,591)	(1,169,924)
Investing activities
Proceeds from sale of property, plant, and equipment		8,522
Purchase of property, plant, and equipment	(98,773)	(181,343)
Proceeds from redemption of life insurance policy		3,066,193
Payments received on notes receivables - related parties	162,457	115,892
Net cash provided by investing activities	63,684	3,009,264
Financing activities
Proceeds from revolving line of credit borrowings	500,000
Principal payments on long-term borrowings		(3,045,421)
Net cash provided by (used in) financing activities	500,000	(3,045,421)
Effect of exchange rate changes on cash and cash equivalents	19,712	(76,733)
Increase (decrease) in cash and cash equivalents	(359,195)	(1,282,814)
Cash and cash equivalents at beginning of year	1,989,974	3,272,788
Cash and cash equivalents at end of year	1,630,779	1,989,974
Supplemental disclosures of cash flow information:
Interest	47,700	99,000
Income taxes paid	$ 355,000	$ 66,600