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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:    
Net income $ 1,951,889us-gaap_NetIncomeLoss $ 2,479,029us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 1,262,725us-gaap_Depreciation 1,093,062us-gaap_Depreciation
Gain from disposal of equipment (15,659)us-gaap_GainLossOnDispositionOfAssets (114,658)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes 6,000us-gaap_DeferredIncomeTaxExpenseBenefit 119,000us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:    
Accounts receivable, net (158,884)us-gaap_IncreaseDecreaseInAccountsReceivable (932,838)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net (281,686)us-gaap_IncreaseDecreaseInInventories 55,584us-gaap_IncreaseDecreaseInInventories
Other current assets (226,548)us-gaap_IncreaseDecreaseInOtherOperatingAssets 126,811us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (79,935)us-gaap_IncreaseDecreaseInAccountsPayable (108,686)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued wages and salaries 44,915us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 150,419us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other accrued expenses (89,123)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 149,601us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Unearned revenue and customer deposits (56,200)us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits 41,161us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits
Net cash provided by operating activities 2,357,494us-gaap_NetCashProvidedByUsedInOperatingActivities 3,058,485us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Capital expenditures (1,656,230)us-gaap_PaymentsToAcquireProductiveAssets (3,444,876)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from the sale of equipment 19,100us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 165,200us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from certificates of deposit 4,133,348us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities 7,088,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Purchases of certificates of deposit (3,984,000)us-gaap_PaymentsToAcquireHeldToMaturitySecurities (6,207,348)us-gaap_PaymentsToAcquireHeldToMaturitySecurities
Net cash used in investing activities (1,487,782)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,399,024)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Cash dividends paid (1,082,068)us-gaap_PaymentsOfDividendsCommonStock (608,663)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities (1,082,068)us-gaap_NetCashProvidedByUsedInFinancingActivities (608,663)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents (212,356)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 50,798us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 443,608us-gaap_CashAndCashEquivalentsAtCarryingValue 392,810us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 231,252us-gaap_CashAndCashEquivalentsAtCarryingValue 443,608us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid for income taxes 1,160,769us-gaap_IncomeTaxesPaid 877,494us-gaap_IncomeTaxesPaid
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 78,811us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 29,982us-gaap_CapitalExpendituresIncurredButNotYetPaid