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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net Income (Loss) $ (722,948) $ 516,401
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 676,137 682,667
Gain on disposal of equipment 0 (5,000)
Deferred income taxes (49,000) 78,000
Changes in operating assets and liabilities:    
Accounts receivable 1,051,677 (258,048)
Inventories 205,391 1,568
Other current assets and prepaid income taxes (292,587) 72,115
Accounts payable (145,401) (265,603)
Accrued wages and salaries 119,541 261,219
Other accrued expenses (126,864) (195,368)
Unearned revenue and customer deposits (73,023) (178,075)
Net cash provided by operating activities 642,923 709,876
Cash flows from investing activities:    
Capital expenditures (255,352) (1,283,736)
Proceeds from the sale of equipment 0 5,000
Proceeds from certificates of deposit 3,486,000 4,324,000
Purchases of certificates of deposit (3,735,000) (2,839,000)
Net cash (used in) provided by investing activities (504,352) 206,264
Cash flows from financing activities:    
Cash dividends paid (309,161) (714,938)
Net cash used in financing activities (309,161) (714,938)
Net (decrease) increase in cash and cash equivalents (170,590) 201,202
Cash and cash equivalents at beginning of period 1,429,454 706,873
Cash and cash equivalents at end of period 1,258,864 908,075
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 0 $ 9,293