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Note 3 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	Jun. 04, 2024	May 10, 2021
Ladenburg Sales Agreement [Member]
Commission Paid, Percentage	3.00%
Maximum [Member] | B. Riley Sales Agreement [Member]
Common Stock, Value, Authorized		$ 25
Maximum [Member] | Ladenburg Sales Agreement [Member]
Common Stock, Value, Authorized	$ 10

X

- Definition

Commission paid, as a percent of the gross sales price per share.

+ References

No definition available.

+ Details

Name:	neon_CommissionPaidPercentage
Namespace Prefix:	neon_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The value of common stock authorized.

+ References

No definition available.

+ Details

Name:	neon_CommonStockValueAuthorized
Namespace Prefix:	neon_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=neon_LadenburgSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=neon_BRileySalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: