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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 1,032,294	$ (413,813)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	990,983	1,014,916
Loss on disposal of equipment	21,564	0
Deferred income taxes	(94,000)	(72,000)
Changes in operating assets and liabilities:
Accounts receivable	(911,293)	(737,602)
Inventories	(2,591,976)	6,371
Other current assets and prepaid income taxes	(7,890)	(149,362)
Accounts payable	710,141	408,134
Accrued wages and salaries	389,796	315,161
Other accrued expenses	34,353	(84,645)
Unearned revenue and customer deposits	(40,959)	(35,351)
Net cash provided by (used in) operating activities	(466,987)	251,809
Cash flows from investing activities:
Capital expenditures	(587,615)	(375,657)
Proceeds from the sale of equipment	7,800	0
Proceeds from certificates of deposit	4,084,000	4,831,000
Purchases of certificates of deposit	(2,092,000)	(4,733,000)
Net cash provided by (used in) investing activities	1,412,185	(277,657)
Cash flows from financing activities:
Cash dividends paid	(637,647)	(405,775)
Net cash used in financing activities	(637,647)	(405,775)
Net increase (decrease) in cash and cash equivalents	307,551	(431,623)
Cash and cash equivalents at beginning of period	2,567,731	1,429,454
Cash and cash equivalents at end of period	$ 2,875,282	$ 997,831

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