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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income $ 462,473us-gaap_NetIncomeLoss $ 568,373us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 312,645us-gaap_Depreciation 305,326us-gaap_Depreciation
(Gain) loss from disposal of equipment 1,088us-gaap_GainLossOnDispositionOfAssets (17,000)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes (24,000)us-gaap_DeferredIncomeTaxExpenseBenefit 7,000us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:    
Accounts receivable (597,655)us-gaap_IncreaseDecreaseInAccountsReceivable (947,840)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 126,926us-gaap_IncreaseDecreaseInInventories (272,644)us-gaap_IncreaseDecreaseInInventories
Other current assets 97,985us-gaap_IncreaseDecreaseInOtherOperatingAssets (23,971)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable 316,075us-gaap_IncreaseDecreaseInAccountsPayable 855,106us-gaap_IncreaseDecreaseInAccountsPayable
Accrued wages and salaries 196,379us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 220,394us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other accrued expenses (242,674)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities (16,974)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Unearned revenue and customer deposits 114,852us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits (50,360)us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits
Net cash provided by operating activities 764,094us-gaap_NetCashProvidedByUsedInOperatingActivities 627,410us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Capital expenditures (371,216)us-gaap_PaymentsToAcquireProductiveAssets (537,588)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from the sale of equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 17,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from certificates of deposit 1,843,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities 1,245,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Purchases of certificates of deposit (1,594,000)us-gaap_PaymentsToAcquireHeldToMaturitySecurities (498,000)us-gaap_PaymentsToAcquireHeldToMaturitySecurities
Net cash provided by (used in) investing activities (122,216)us-gaap_NetCashProvidedByUsedInInvestingActivities 226,412us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Cash dividends paid (415,437)us-gaap_PaymentsOfDividendsCommonStock (560,357)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities (415,437)us-gaap_NetCashProvidedByUsedInFinancingActivities (560,357)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase in cash and cash equivalents 226,441us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 293,465us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 231,252us-gaap_CashAndCashEquivalentsAtCarryingValue 443,608us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 457,693us-gaap_CashAndCashEquivalentsAtCarryingValue 737,073us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 42,468us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 13,030us-gaap_CapitalExpendituresIncurredButNotYetPaid