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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss $ (944,345)us-gaap_NetIncomeLoss $ (2,038,392)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided (used) by operating activities:    
Provision for doubtful accounts 100,000us-gaap_ProvisionForDoubtfulAccounts  
Depreciation and amortization 225,834us-gaap_GainLossOnDispositionOfAssets 326,482us-gaap_GainLossOnDispositionOfAssets
(Increase) decrease in assets:    
Inventories (977,205)us-gaap_IncreaseDecreaseInInventories 331,314us-gaap_IncreaseDecreaseInInventories
Accounts receivable 2,120,322us-gaap_IncreaseDecreaseInAccountsReceivable 301,994us-gaap_IncreaseDecreaseInAccountsReceivable
Other current assets 305,608us-gaap_IncreaseDecreaseInOtherCurrentAssets 461,559us-gaap_IncreaseDecreaseInOtherCurrentAssets
Increase (decrease) in liabilities:    
Accounts payable (188,786)us-gaap_IncreaseDecreaseInAccountsPayable (1,262,123)us-gaap_IncreaseDecreaseInAccountsPayable
Other accrued liabilities (85,261)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities (693,437)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Income taxes payable 62us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (86,165)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided (used) by operating activities 556,229us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (2,658,768)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchase of property, plant, and equipment (363,177)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (738,597)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Changes in restricted cash (295)us-gaap_IncreaseDecreaseInRestrictedCash  
Net cash used by investing activities (363,472)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (738,597)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Repayments of long-term debt and notes payable (37,064)us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities (82,214)us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities
Proceeds from the exercise of stock options 60,583us-gaap_ProceedsFromStockOptionsExercised 106,289us-gaap_ProceedsFromStockOptionsExercised
Payment of Preferred Stock dividends   (57,613)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Net cash provided (used) by financing activities 23,519us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (33,538)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents 216,276us-gaap_NetCashProvidedByUsedInContinuingOperations (3,430,903)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at:    
Beginning of period 22,128,977us-gaap_CashAndCashEquivalentsAtCarryingValue 27,629,359us-gaap_CashAndCashEquivalentsAtCarryingValue
End of period 22,345,253us-gaap_CashAndCashEquivalentsAtCarryingValue 24,198,456us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental schedule of cash flow information:    
Interest paid 53,810us-gaap_InterestPaid 57,168us-gaap_InterestPaid
Income taxes paid 1,981us-gaap_IncomeTaxesPaid 87,995us-gaap_IncomeTaxesPaid
Supplemental schedule of noncash investing and financing activities:    
Preferred dividends declared, not paid $ 170,817us-gaap_DividendsPreferredStockCash $ 57,613us-gaap_DividendsPreferredStockCash