Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net Income	$ 832,198	$ 1,698,629
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,029,998	973,182
Gain on disposal of equipment	(5,000)	(26,135)
Deferred income taxes	134,000	118,000
Changes in operating assets and liabilities:
Accounts receivable	(84,715)	(1,175,724)
Inventories	624,058	(726,233)
Other current assets and prepaid income taxes	(320,611)	(106,338)
Accounts payable	(72,255)	460,603
Accrued wages and salaries	160,519	221,074
Other accrued expenses	(171,741)	(54,780)
Unearned revenue and customer deposits	(125,529)	61,073
Net cash provided by operating activities	2,000,922	1,443,351
Cash flows from investing activities:
Capital expenditures	(1,562,784)	(1,635,189)
Proceeds from the sale of equipment	5,000	26,135
Proceeds from certificates of deposit	5,569,000	3,735,000
Purchases of certificates of deposit	(4,582,000)	(2,739,000)
Net cash used in investing activities	(570,784)	(613,054)
Cash flows from financing activities:
Cash dividends paid	(927,487)	(898,503)
Net cash used in financing activities	(927,487)	(898,503)
Net increase (decrease) in cash and cash equivalents	502,651	(68,206)
Cash and cash equivalents at beginning of period	706,873	1,152,569
Cash and cash equivalents at end of period	1,209,524	1,084,363
Supplemental schedule of non-cash investing activities:
Capital expenditures in accounts payable	$ 0	$ 7,265