Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 662,336	$ 623,644
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	143,789	144,893
Stock-based compensation		5,306
Non-cash other revenue		(86,433)
Non-cash miscellaneous loss		24,618
(Gain) loss on sale of property, plant and equipment		(434,549)
Foreign currency transaction (gain) loss	87,162	5,925
(Increase) decrease in trade, accounts & notes receivable, and deposits from related parties	(104,389)	(839,989)
(Increase) decrease in inventories	(189,667)	705,371
(Increase) decrease in refundable income taxes	(223,097)	1,918
(Increase) decrease in prepaid expenses and other current assets	(364,638)	(251,056)
(Increase) decrease in other assets		(49,681)
Increase (decrease) in income taxes payable	40,411	42,522
Increase (decrease) in accounts payable & accrued expenses, deferred revenue, and other noncurrent liabilities	1,209,504	(19,235)
Net cash provided by (used in) operating activities	1,261,411	(126,746)
Investing activities:
Purchase of property, plant and equipment	(9,207)	(38,890)
Payments received on notes receivables - related parties	31,928	49,691
Net cash provided by investing activities	22,721	10,801
Financing activities:
Proceeds from line of credit borrowings		500,000
Net cash provided by financing activities		500,000
Effect of exchange rate changes on cash and cash equivalents	(86,272)	7,058
Increase (decrease) in cash and cash equivalents	1,197,860	391,113
Cash and cash equivalents at beginning of period	1,630,779	1,989,974
Cash and cash equivalents at end of period	$ 2,828,639	$ 2,381,087