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Note 14 - Subsequent Events (Details Textual) - USD ($) | Jul. 20, 2021 | Jul. 09, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Subsequent Event [Member] | Sale of TOT Group, Inc. [Member] |  |  |
Sale of Stock, Percentage of Ownership before Transaction | 100.00% |  |
Esousa Holdings LLC [Member] | ESOUSA Agreement [Member] |  |  |
Maximum Amount of Promissory Notes Authorized to be Purchased |  |  | $ 15,000,000
Esousa Holdings LLC [Member] | ESOUSA Agreement [Member] | Subsequent Event [Member] |  |  |
Master Exchange Agreement, Finance, Percentage of Gross Proceeds from Sale of Common Stock |  | 88.00% |
Master Exchange Agreement, Amount of Each Tranche |  | $ 100,000 |

X
- Definition Amount of each portion of promissory notes authorized to be purchase pursuant to the master exchange agreement. + References No definition available. + Details
Name: | nete_MasterExchangeAgreementAmountOfEachTranche
Namespace Prefix: | nete_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of the gross proceeds from the shares of common stock sold by the counter party to finance the purchase of exchange amount pursuant to the master exchange agreement. + References No definition available. + Details
Name: | nete_MasterExchangeAgreementFinancePercentageOfGrossProceedsFromSaleOfCommonStock
Namespace Prefix: | nete_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum amount of promissory notes authorized to be purchased pursuant to the agreement. + References No definition available. + Details
Name: | nete_MaximumAmountOfPromissoryNotesAuthorizedToBePurchased
Namespace Prefix: | nete_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=nete_SaleOfTOTGroupIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nete_ESOUSAHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=nete_ESOUSAAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |