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Note 12 - Stock Based Compensation and Other Benefit Plans (Details) - Weighted-average Exercise Price and Weighted-Average Grant Date Fair Value, Restricted Stock Units (Performance Based Restricted Stock Units and Cash Settled Performance Based Restricted Stock Units [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Performance Based Restricted Stock Units and Cash Settled Performance Based Restricted Stock Units [Member]
    
Note 12 - Stock Based Compensation and Other Benefit Plans (Details) - Weighted-average Exercise Price and Weighted-Average Grant Date Fair Value, Restricted Stock Units [Line Items]    
Estimated fair value at date of grant $ 12.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nr_PerformanceBasedRestrictedStockUnitsAndCashSettledPerformanceBasedRestrictedStockUnitsMember		 $ 13.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nr_PerformanceBasedRestrictedStockUnitsAndCashSettledPerformanceBasedRestrictedStockUnitsMember