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Balance Sheet Details - Other Accrued Expenses (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Details    
Profit sharing plant contribution $ 314,155us-gaap_OtherEmployeeRelatedLiabilitiesCurrent $ 391,945us-gaap_OtherEmployeeRelatedLiabilitiesCurrent
Property taxes 92,901us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 91,957us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
All other items 113,667us-gaap_OtherAccruedLiabilitiesCurrent 125,944us-gaap_OtherAccruedLiabilitiesCurrent
Other accrued exenses $ 520,723us-gaap_AccruedLiabilitiesCurrent $ 609,846us-gaap_AccruedLiabilitiesCurrent