Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net Income (Loss)	$ (413,813)	$ 832,198
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	1,014,916	1,029,998
Gain on disposal of equipment	0	(5,000)
Deferred income taxes	(72,000)	134,000
Changes in operating assets and liabilities:
Accounts receivable	(737,602)	(84,715)
Inventories	6,371	624,058
Other current assets and prepaid income taxes	(149,362)	(320,611)
Accounts payable	408,134	(72,255)
Accrued wages and salaries	315,161	160,519
Other accrued expenses	(84,645)	(171,741)
Unearned revenue and customer deposits	(35,351)	(125,529)
Net cash provided by operating activities	251,809	2,000,922
Cash flows from investing activities:
Capital expenditures	(375,657)	(1,562,784)
Proceeds from the sale of equipment	0	5,000
Proceeds from certificates of deposit	4,831,000	5,569,000
Purchases of certificates of deposit	(4,733,000)	(4,582,000)
Net cash used in investing activities	(277,657)	(570,784)
Cash flows from financing activities:
Cash dividends paid	(405,775)	(927,487)
Net cash used in financing activities	(405,775)	(927,487)
Net (decrease) increase in cash and cash equivalents	(431,623)	502,651
Cash and cash equivalents at beginning of period	1,429,454	706,873
Cash and cash equivalents at end of period	997,831	1,209,524
Supplemental schedule of non-cash investing activities:
Capital expenditures in accounts payable	$ 0	$ 0