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Note 7 - Fair Value Measurements - Measure Nonrecurring Fair Value Measurements (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Impaired loans | $ 569 | $ 663
Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | $ 569 | $ 663

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- Definition Represents fair value disclosure of impaired loans. + References No definition available. + Details
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Namespace Prefix: | nsts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Data Type: | na
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- Details
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Data Type: | na
Balance Type: |
Period Type: |