Note 3 - Investments - Fair Value of Financial Instruments on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Restricted cash	$ 9,818		$ 11,850
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	10,732	$ 10,333
Restricted cash	9,818	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	3,093	3,088
Fair Value, Recurring [Member] | Reported Value Measurement [Member]
Cash and cash equivalents	10,732	10,333
Restricted cash	9,818	6,746
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Investment in Limited Partnership [Member]
Investments in limited partnerships	3,093	3,088
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	10,732	10,333
Restricted cash	9,818	6,746
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Investment in Limited Partnership [Member]
Investments in limited partnerships	$ 3,093	$ 3,088