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Note 3 - Summary of Significant Accounting Policies - Delinquency Status of Gross Notes Receivable (Details) (Student Notes Receivable [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Student Notes Receivable [Member]
 
Current $ 5,646us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= stnr_StudentNotesReceivableMember
1 - 30 510us-gaap_FinancingReceivableRecordedInvestment1To29DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= stnr_StudentNotesReceivableMember
31 - 60 774us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= stnr_StudentNotesReceivableMember
61 - 90 256us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= stnr_StudentNotesReceivableMember
91+ 543us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= stnr_StudentNotesReceivableMember
$ 7,729us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= stnr_StudentNotesReceivableMember