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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)		Jun. 30, 2025	Dec. 31, 2024
Deposits with Clearing Organizations and Others, Securities	[1]	$ 43,045,922	$ 36,229,375
[1] Cost of short-term investments held at the broker (restricted): $43,045,459 and $36,223,466, respectively.

X

- Definition

The amount of securities on deposit with clearing organizations and other entities which provide services necessary to operations of the Company. This item would include, for instance, securities advanced as refundable collateral for securities borrowed.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant