Note 4 - Fair Value Measurements (Details Textual) - CBOT Wheat Futures DEC26 [Member]	Sep. 30, 2025	Jun. 30, 2025
Maximum [Member] \| Fair Value, Inputs, Level 2 [Member]
Investment Owned, Balance, Contracts		175
Minimum [Member] \| Fair Value, Inputs, Level 1 [Member]
Investment Owned, Balance, Contracts	175

Balance held at close of period in number of contracts.

No definition available.

Name:	us-gaap_InvestmentOwnedBalanceContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant