Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net income (loss)	$ 463,279	$ 235,539
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	288,273	292,842
Stock-based compensation		10,612
Non-cash other revenue		(172,866)
Non-cash miscellaneous loss		24,618
(Gain) loss on sale of property, plant and equipment		(434,549)
Foreign currency transaction (gain) loss	21,694	1,149
(Increase) decrease in trade, accounts & notes receivable, and deposits from related parties	30,349	(715,018)
(Increase) decrease in inventories	(380,827)	758,798
(Increase) decrease in refundable income taxes	(227,553)	(3,295)
(Increase) decrease in prepaid expenses and other current assets	(304,407)	(295,925)
(Increase) decrease in other assets		(68,807)
Increase (decrease) in income taxes payable	(71,132)	16,148
Increase (decrease) in accounts payable & accrued expenses, deferred revenue, and other noncurrent liabilities	402,018	(293,111)
Net cash provided by (used in) operating activities	221,694	(643,865)
Investing activities:
Purchase of property, plant and equipment	(17,363)	(50,180)
Payments received on notes receivables - related parties	64,337	109,984
Net cash provided by investing activities	46,974	59,804
Financing activities:
Proceeds from line of credit borrowings		500,000
Proceeds from long-term borrowings	862,000
Net cash provided by financing activities	862,000	500,000
Effect of exchange rate changes on cash and cash equivalents	(30,775)	12,808
Increase (decrease) in cash and cash equivalents	1,099,893	(71,253)
Cash and cash equivalents at beginning of period	1,630,779	1,989,974
Cash and cash equivalents at end of period	$ 2,730,672	$ 1,918,721