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Note 3 - Investments in Debt Securities - Amortized Cost to Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Fair value, amortized cost	$ 492	$ 2,687
Unrealized gains	0	5
Fair value	$ 492	$ 2,692

X

- Definition

Amount of accumulated unrecognized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity).

+ References

No definition available.

+ Details

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Namespace Prefix:	mlp_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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