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Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 479,082us-gaap_NetIncomeLoss $ (13,335)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 115,664us-gaap_Depreciation 112,362us-gaap_Depreciation
Amortization 720us-gaap_AdjustmentForAmortization 719us-gaap_AdjustmentForAmortization
Deferred income taxes 332,718us-gaap_DeferredIncomeTaxesAndTaxCredits 14,236us-gaap_DeferredIncomeTaxesAndTaxCredits
Stock-based compensation 4,478us-gaap_ShareBasedCompensation 7,358us-gaap_ShareBasedCompensation
Gain on disposal of fixed assets (5,306)us-gaap_GainLossOnDispositionOfAssets 0us-gaap_GainLossOnDispositionOfAssets
Changes in:    
Receivables 250,438us-gaap_IncreaseDecreaseInReceivables (88,616)us-gaap_IncreaseDecreaseInReceivables
Inventory 367,092us-gaap_IncreaseDecreaseInInventories 259,183us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (30,222)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 1,028us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses (112,903)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 11,904us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by operating activities 1,401,761us-gaap_NetCashProvidedByUsedInOperatingActivities 304,839us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES :    
Purchase of property, plant and equipment (988,459)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (44,853)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Maturities of investments 1,245,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments 1,494,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments
Purchases of investments 0us-gaap_PaymentsToAcquireShortTermInvestments (1,741,000)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from sale of fixed assets 5,565us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash provided by (used for) investing activities 262,106us-gaap_NetCashProvidedByUsedInInvestingActivities (291,853)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (49,057)us-gaap_RepaymentsOfDebt (46,790)us-gaap_RepaymentsOfDebt
Proceeds from exercise of stock options 5,250us-gaap_ProceedsFromStockOptionsExercised 3,150us-gaap_ProceedsFromStockOptionsExercised
Net cash (used for) financing activities (43,807)us-gaap_NetCashProvidedByUsedInFinancingActivities (43,640)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,620,060us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (30,654)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
BEGINNING CASH AND CASH EQUIVALENTS 850,028us-gaap_CashAndCashEquivalentsAtCarryingValue 2,270,385us-gaap_CashAndCashEquivalentsAtCarryingValue
ENDING CASH AND CASH EQUIVALENTS 2,470,088us-gaap_CashAndCashEquivalentsAtCarryingValue 2,239,731us-gaap_CashAndCashEquivalentsAtCarryingValue
INCOME TAXES PAID 2,800us-gaap_IncomeTaxesPaid 252us-gaap_IncomeTaxesPaid
INTEREST EXPENSE PAID 13,050us-gaap_InterestPaid 15,175us-gaap_InterestPaid
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (151,588)us-gaap_CapitalExpendituresIncurredButNotYetPaid 191,862us-gaap_CapitalExpendituresIncurredButNotYetPaid
Net change in fair value of interest rate swap $ 3,906us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 $ 1,408us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1