v2.4.1.9
STOCKHOLDERS' EQUITY (Details 2) (Warrant [Member], USD $)
6 Months Ended 12 Months Ended
Nov. 30, 2015
May 31, 2015
Warrant [Member]
   
Number of Shares    
Outstanding 1,245,903us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
676,077us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Issued 392,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
569,826us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Exercised 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Expired 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Outstanding 1,637,903us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
1,245,903us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Weighted Average Price Per Share    
Outstanding $ 17.60staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
$ 19.70staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Issued $ 10.00staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
$ 15.00staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Exercised $ 0staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
$ 0staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Expired $ 0staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
$ 0staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Outstanding $ 15.80staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
$ 17.60staf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember