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Note 13 - Stockholder Rights Plan (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Common Stock Rights Plan [Abstract]  
Number of Preferred Stock Purchase Right Granted, per Common Share 1spf_NumberOfPreferredStockPurchaseRightGrantedPerCommonShare
Beneficial Ownership Threshold 15.00%spf_BeneficialOwnershipThreshold
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) $ 20.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Percentage of Discount On Then-Current Market Value 50.00%spf_PercentageOfDiscountOnThencurrentMarketValue
Redemption Rate, per Right (in Dollars per Item) 0.001spf_RedemptionRatePerRight
Expiration of Rights After Separation From Common Shares 3 years