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Note 8 - Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Value Hierarchy of Certain Financial Information (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Reported Value Measurement [Member] |  |  |
Loans, net | $ 95,378 |  | $ 96,534
Interest-bearing deposits | 173,420 |  | 186,531
Loans held for sale |  | $ 104 |
Estimate of Fair Value Measurement [Member] |  |  |
Loans, net | 97,213 |  | 96,391
Interest-bearing deposits | 155,984 |  | 181,564
Loans held for sale |  | 112 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Loans, net | 0 |  | 0
Interest-bearing deposits | 0 |  | 0
Loans held for sale |  | 0 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Loans, net | 96,444 |  | 95,612
Interest-bearing deposits | 155,984 |  | 181,564
Loans held for sale |  | 112 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Loans, net | 769 |  | 779
Interest-bearing deposits | $ 0 |  | $ 0
Loans held for sale |  | $ 0 |

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- Definition Represents fair value of interest-bearing deposit liabilities. + References No definition available. + Details
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Namespace Prefix: | nsts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI https://asc.fasb.org/subtopic&trid=2196772 + Details
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- Details
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