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Note 4 - Earnings Per Common Share (Details) - Components Used in Computation of Basic and Diluted Earnings Per Common Share (Parentheticals) (1¼% Convertible Senior Notes Due August 2032 [Member])
Mar. 31, 2015
Mar. 31, 2014
1¼% Convertible Senior Notes Due August 2032 [Member]
    
Note 4 - Earnings Per Common Share (Details) - Components Used in Computation of Basic and Diluted Earnings Per Common Share (Parentheticals) [Line Items]    
Interest on convertible senior notes 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= spf_OnePointTwentyFivePercentConvertibleSeniorNotesDueAugust2032Member		 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= spf_OnePointTwentyFivePercentConvertibleSeniorNotesDueAugust2032Member