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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:    
Net Income $ 538,314 $ 2,001,185
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:    
Depreciation and Amortization 1,382,235 1,308,448
Gain on the Sale of Equipment (228) (13,086)
Deferred Income Taxes 22,000 184,000
Changes in Operating Assets and Liabilities:    
Accounts Receivable, net 919,993 (202,657)
Inventories, net 1,149,214 (1,572,291)
Other Current Assets 103,530 (146,878)
Accounts Payable (569,651) 298,348
Accrued Wages and Salaries (71,462) 27,118
Other Accrued Expenses (126,904) (19,159)
Unearned Revenue and Customer Deposits (175,510) 15,379
Net Cash Provided by Operating Activities 3,171,531 1,880,407
Cash Flows from Investing Activities:    
Capital Expenditures (1,802,914) (1,998,347)
Proceeds from the Sale of Equipment 5,000 26,635
Proceeds from Certificates of Deposit 7,312,000 5,727,000
Purchases of Certificates of Deposit (6,823,000) (4,980,000)
Net Cash Used in Investing Activities (1,308,914) (1,224,712)
Cash Flows from Financing Activities:    
Cash Dividends Paid (1,140,036) (1,101,391)
Net Cash Used in Financing Activities (1,140,036) (1,101,391)
Net Increase (Decrease) in Cash and Cash Equivalents 722,581 (445,696)
Beginning of Year 706,873 1,152,569
End of Year 1,429,454 706,873
Net Cash Paid for Income Taxes 30,500 437,574
Supplemental Schedule of Non-cash Investing Activities:    
Capital Expenditures in Accounts Payable $ 0 $ 24,843