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Note 16 - Fair Value Measurements (Details) - Impaired Loans and Other Real Estate Owned Measured at Fair Value on Nonrecurring Basis (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 16 - Fair Value Measurements (Details) - Impaired Loans and Other Real Estate Owned Measured at Fair Value on Nonrecurring Basis [Line Items]    
Impaired loans $ 7,224nksh_ImpairedLoansNetFairValueDisclosure $ 1,989nksh_ImpairedLoansNetFairValueDisclosure
Other real estate owned 4,744nksh_OtherRealEstateFairValueDisclosure 4,712nksh_OtherRealEstateFairValueDisclosure
Fair Value, Inputs, Level 3 [Member]    
Note 16 - Fair Value Measurements (Details) - Impaired Loans and Other Real Estate Owned Measured at Fair Value on Nonrecurring Basis [Line Items]    
Impaired loans 7,224nksh_ImpairedLoansNetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 1,989nksh_ImpairedLoansNetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Other real estate owned $ 4,744nksh_OtherRealEstateFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 4,712nksh_OtherRealEstateFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member