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Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net (loss) income $ (167,159)us-gaap_NetIncomeLoss $ 117,395us-gaap_NetIncomeLoss $ 89,512us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Depreciation 446,045us-gaap_Depreciation 414,307us-gaap_Depreciation 399,640us-gaap_Depreciation
Amortization 2,876us-gaap_AdjustmentForAmortization 2,894us-gaap_AdjustmentForAmortization 2,876us-gaap_AdjustmentForAmortization
Deferred income taxes (88,590)us-gaap_DeferredIncomeTaxesAndTaxCredits 87,166us-gaap_DeferredIncomeTaxesAndTaxCredits 94,370us-gaap_DeferredIncomeTaxesAndTaxCredits
Stock-based compensation 30,004us-gaap_ShareBasedCompensation 31,359us-gaap_ShareBasedCompensation 35,985us-gaap_ShareBasedCompensation
Loss on disposal of fixed assets 4,519us-gaap_GainLossOnDispositionOfAssets 35,179us-gaap_GainLossOnDispositionOfAssets 12,265us-gaap_GainLossOnDispositionOfAssets
Changes in:      
Receivables (373,882)us-gaap_IncreaseDecreaseInReceivables (20,056)us-gaap_IncreaseDecreaseInReceivables (227,558)us-gaap_IncreaseDecreaseInReceivables
Inventory 260,753us-gaap_IncreaseDecreaseInInventories 442,494us-gaap_IncreaseDecreaseInInventories 17,463us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets 2,548us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 45,917us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (123,628)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses 178,560us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (57,995)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 51,715us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue 6,690us-gaap_IncreaseDecreaseInDeferredRevenue 0us-gaap_IncreaseDecreaseInDeferredRevenue (8,250)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by operating activities 302,364us-gaap_NetCashProvidedByUsedInOperatingActivities 1,098,660us-gaap_NetCashProvidedByUsedInOperatingActivities 344,390us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES :      
Purchase of property, plant and equipment (1,535,558)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (597,697)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (275,395)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Maturities of short-term investments 2,985,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments 2,489,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments 4,178,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments
Purchases of short-term investments (2,489,000)us-gaap_PaymentsToAcquireShortTermInvestments (3,234,000)us-gaap_PaymentsToAcquireShortTermInvestments (2,240,000)us-gaap_PaymentsToAcquireShortTermInvestments
Purchases of long-term investments (496,000)us-gaap_PaymentsToAcquireLongtermInvestments 0us-gaap_PaymentsToAcquireLongtermInvestments 0us-gaap_PaymentsToAcquireLongtermInvestments
Net cash (used for) provided by investing activities (1,535,558)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,342,697)us-gaap_NetCashProvidedByUsedInInvestingActivities 1,662,605us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:      
Debt principal repayments (190,312)us-gaap_RepaymentsOfDebt (181,445)us-gaap_RepaymentsOfDebt (172,853)us-gaap_RepaymentsOfDebt
Proceeds from exercise of stock options 3,149us-gaap_ProceedsFromStockOptionsExercised 21,750us-gaap_ProceedsFromStockOptionsExercised 50,800us-gaap_ProceedsFromStockOptionsExercised
Tax benefits related to stock options 0us-gaap_DeferredTaxExpenseFromStockOptionsExercised 398us-gaap_DeferredTaxExpenseFromStockOptionsExercised 7,261us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Net cash (used for) financing activities (187,163)us-gaap_NetCashProvidedByUsedInFinancingActivities (159,297)us-gaap_NetCashProvidedByUsedInFinancingActivities (114,792)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (1,420,357)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (403,334)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,892,203us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
BEGINNING CASH AND CASH EQUIVALENTS 2,270,385us-gaap_CashAndCashEquivalentsAtCarryingValue 2,673,719us-gaap_CashAndCashEquivalentsAtCarryingValue 781,516us-gaap_CashAndCashEquivalentsAtCarryingValue
ENDING CASH AND CASH EQUIVALENTS 850,028us-gaap_CashAndCashEquivalentsAtCarryingValue 2,270,385us-gaap_CashAndCashEquivalentsAtCarryingValue 2,673,719us-gaap_CashAndCashEquivalentsAtCarryingValue
INCOME TAXES PAID 252us-gaap_IncomeTaxesPaid 0us-gaap_IncomeTaxesPaid 708us-gaap_IncomeTaxesPaid
INTEREST EXPENSE PAID 58,413us-gaap_InterestPaid 67,015us-gaap_InterestPaid 75,681us-gaap_InterestPaid
NON-CASH ACTIVITIES:      
Capital expenditures included in accounts payable and accrued expenses 251,383us-gaap_CapitalExpendituresIncurredButNotYetPaid 23,495us-gaap_CapitalExpendituresIncurredButNotYetPaid 4,550us-gaap_CapitalExpendituresIncurredButNotYetPaid
Net change in fair value of interest rate swap $ 3,495us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 $ (30,284)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 $ 9,308us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1