Note 3 - Investments - Fair Value of Financial Instruments on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Restricted cash	$ 9,808		$ 11,071
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	12,329	$ 10,333
Restricted cash	9,808	6,746
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Investment in Limited Partnership [Member]
Investments in limited partnerships	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Investment in Limited Partnership [Member]
Investments in limited partnerships	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Investment in Limited Partnership [Member]
Investments in limited partnerships	0	0
Fair Value, Recurring [Member] \| Fair Value Measured at Net Asset Value Per Share [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Fair Value, Recurring [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Investment in Limited Partnership [Member]
Investments in limited partnerships	2,722	3,088
Fair Value, Recurring [Member] \| Reported Value Measurement [Member]
Cash and cash equivalents	12,329	10,333
Restricted cash	9,808	6,746
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Investment in Limited Partnership [Member]
Investments in limited partnerships	2,722	3,088
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	12,329	10,333
Restricted cash	9,808	6,746
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Investment in Limited Partnership [Member]
Investments in limited partnerships	$ 2,722	$ 3,088