Note 2 - Significant Accounting Policies - Fair Value Measurements (Details) - Fair Value, Recurring [Member]	Jun. 30, 2026 USD ($)
Total	$ 3,462,700
SPAR Group Common Stock [Member]
SPAR common stock, at fair value	3,462,700
Fair Value, Inputs, Level 1 [Member]
Total	3,462,700
Fair Value, Inputs, Level 1 [Member] \| SPAR Group Common Stock [Member]
SPAR common stock, at fair value	3,462,700
Fair Value, Inputs, Level 2 [Member]
Total	0
Fair Value, Inputs, Level 2 [Member] \| SPAR Group Common Stock [Member]
SPAR common stock, at fair value	0
Fair Value, Inputs, Level 3 [Member]
Total	0
Fair Value, Inputs, Level 3 [Member] \| SPAR Group Common Stock [Member]
SPAR common stock, at fair value	$ 0

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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+ Details