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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 1,410,880 $ 973,277
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 653,537 613,167
Gain on disposal of equipment (17,485) (1,600)
Deferred income taxes (27,000) (48,000)
Changes in operating assets and liabilities:    
Accounts receivable (1,580,776) (629,324)
Inventories (922,121) (458,150)
Other current assets 111,554 7,372
Accounts payable 779,782 288,102
Accrued wages and salaries 246,972 161,600
Other accrued expenses 137,353 (58,057)
Unearned revenue and customer deposits (91,205) (34,395)
Net cash provided by operating activities 701,491 813,992
Cash flows from investing activities:    
Capital expenditures 635,718 796,258
Proceeds from the sale of equipment 17,485 1,600
Proceeds from certificates of deposit 1,992,000 3,328,000
Purchases of certificates of deposit 1,245,000 2,083,000
Net cash provided by investing activities 128,767 450,342
Cash flows from financing activities:    
Cash dividends paid 695,615 724,599
Net cash used in financing activities (695,615) (724,599)
Net increase in cash and cash equivalents 134,643 539,735
Cash and cash equivalents at beginning of period 1,152,569 353,475
Cash and cash equivalents at end of period 1,287,212 893,210
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 0 $ 2,900