Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 1)

v2.4.1.9
Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Income Tax Disclosure [Abstract]    
Tax provision (benefit) at statutory federal rate $ (334)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 74us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Nondeductible expenses 3us-gaap_IncomeTaxReconciliationNondeductibleExpense 6us-gaap_IncomeTaxReconciliationNondeductibleExpense
Change in valuation and other 1,408us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance   
Provision for (Benefit from) income taxes, net $ 1,077us-gaap_IncomeTaxExpenseBenefit $ 80us-gaap_IncomeTaxExpenseBenefit
Tax provision (benefit) at statutory federal rate (in percentage) (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Nondeductible expenses (in percentage) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Change in valuation and other (in percentage) 143.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance   
Provision for (Benefit from) income taxes, net (in percentage) 109.00%opxs_IncomeTaxExpenseBenefitPercentage 37.00%opxs_IncomeTaxExpenseBenefitPercentage