Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net income (loss)	$ 235,539	$ (1,216,259)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	292,842	403,430
Stock-based compensation	10,612	15,069
Non-cash life insurance policy reduction / (accretion)		19,162
Non-cash other revenue	(172,866)
Non-cash miscellaneous loss	24,618
(Gain) loss on sale of property, plant and equipment	(434,549)	(2,838)
Foreign currency transaction (gain) loss	1,149	(194)
(Increase) decrease in trade, accounts & notes receivable, and deposits from related parties	(715,018)	(180,145)
(Increase) decrease in inventories	758,798	415,760
(Increase) decrease in refundable income taxes	(3,295)	3,616
(Increase) decrease in prepaid expenses and other current assets	(295,925)	(274,252)
(Increase) decrease in other assets	(68,807)	(948)
Increase (decrease) in income taxes payable	16,148	(6,930)
Increase (decrease) in accounts payable & accrued expenses, deferred revenue, and other noncurrent liabilities	(293,111)	568,291
Net cash used in operating activities	(643,865)	(256,238)
Investing activities:
Purchase of property, plant and equipment	(50,180)	(56,968)
Proceeds from the sale of property, plant and equipment		3,888
Payments received on notes receivables - related parties	109,984	57,079
Net cash provided by investing activities	59,804	3,999
Financing activities:
Proceeds from line of credit borrowings	500,000
Principal payments on long-term borrowings		(189,560)
Net cash provided by (used in) financing activities	500,000	(189,560)
Effect of exchange rate changes on cash and cash equivalents	12,808	(66,901)
Increase (decrease) in cash and cash equivalents	(71,253)	(508,700)
Cash and cash equivalents at beginning of period	1,989,974	3,272,788
Cash and cash equivalents at end of period	$ 1,918,721	$ 2,764,088