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Consolidated Statements of Equity (Unaudited) (USD $)
In Thousands
Total
Common Stock
Class A common stock
Common Stock
Class B common stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Noncontrolling Interest
Beginning balance at Aug. 01, 2014 $ 16,699us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 110us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 14,886us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,037us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   $ (342)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Beginning balance, Shares at Aug. 01, 2014   787us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
11,013us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
        
Common stock issued for compensation 1,524us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross    2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,522us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        
Common stock issued for compensation, Shares      207us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock issued for exercises of stock options (46)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised       46us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        
Common stock issued for exercises of stock options, Shares      8us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock repurchased for withholding tax purposes (545)strp_CommonStockWithheldForTaxPurposes             (545)strp_CommonStockWithheldForTaxPurposes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
  
Sale of treasury stock 65us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued             65us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
  
Sale of treasury stock, Shares                
Forfeiture of unvested shares                     
Forfeiture of unvested shares, Shares      (2)us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income 1,645us-gaap_ProfitLoss          1,227us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   418us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Dividends (875)us-gaap_StockIssuedDuringPeriodValueStockDividend                (875)us-gaap_StockIssuedDuringPeriodValueStockDividend
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Ending balance at Apr. 30, 2015 $ 18,559us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 112us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 16,454us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 3,264us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (480)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ (799)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Ending balance, Shares at Apr. 30, 2015   787us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
11,226us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember