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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 647,057 $ 462,473
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 299,355 312,645
(Gain) Loss from disposal of equipment (1,022) 1,088
Deferred income taxes (8,000) (24,000)
Changes in operating assets and liabilities:    
Accounts receivable (673,585) (597,655)
Inventories (381,492) 126,926
Other current assets 270,617 97,985
Accounts payable 649,419 316,075
Accrued wages and salaries 22,441 196,379
Other accrued expenses (128,290) (242,674)
Unearned revenue and customer deposits (19,000) 114,852
Net cash provided by operating activities 677,500 764,094
Cash flows from investing activities:    
Capital expenditures (596,831) (371,216)
Proceeds from the sale of equipment 1,022  
Proceeds from certificates of deposit 1,494,000 1,843,000
Purchases of certificates of deposit (996,000) (1,594,000)
Net cash used in investing activities (97,809) (122,216)
Cash flows from financing activities:    
Cash dividends paid (415,437) (415,437)
Net cash used in financing activities (415,437) (415,437)
Net increase (decrease) in cash and cash equivalents 164,254 226,441
Cash and cash equivalents at beginning of period 800,894 231,252
Cash and cash equivalents at end of period 965,148 457,693
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 2,550 $ 42,468