Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES
Net income	$ (365,264)	$ 1,668,618
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	259,801	249,889
Gain on sale of fixed assets	0	(16,930)
Bad debt expense	133,803	177,906
Stock awards issued for services	66,348	66,714
Changes in operating assets and liabilities:
Accounts receivable	1,314,939	654,710
Income taxes receivable/payable	107,561	(234,042)
Inventories	537,668	656,988
Prepaid expenses	168,546	(239,395)
Deferred tax asset/liability	(114,564)	123,764
Accounts payable and accrued liabilities	(1,837,760)	(499,721)
Net Cash Provided by Operating Activities	271,078	2,608,501
INVESTING ACTIVITIES
Proceeds from sale of equipment	0	18,400
Sale of investments	387,326	647,739
Purchase of fixed assets	(525,384)	(443,883)
Net Cash Provided by (Used in) Investing Activities	(138,058)	222,256
FINANCING ACTIVITIES
Value of equity awards surrendered by employees for tax liability	(148,879)	(143,022)
Cash received in exercise of stock options	2,020	0
Purchase of treasury stock	0	(1,333,578)
Principal paid towards lease liability	(19,089)	(15,718)
Net Cash Used in Financing Activities	(165,948)	(1,492,318)
Effect of exchange rate changes on cash	(95,598)	16,507
NET CHANGE IN CASH	(128,526)	1,354,946
CASH AT BEGINNING OF PERIOD	7,358,856	10,101,932
CASH AT END OF PERIOD	7,230,330	11,456,878
CASH PAID FOR:
Interest	872	1,411
Income taxes	0	711,524
NON-CASH FINANCING AND INVESTING ACTIVITIES:
Common stock issued in settlement of accrued bonuses	$ 419,373	$ 379,861