Note 6 - Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Corporate debt obligations	$ 4,366	$ 4,746
Corporate Debt Securities [Member]
Corporate debt obligations	505	500
Residential Mortgage-Backed Securities [Member]
Corporate debt obligations	3,861	4,246
Fair Value, Recurring [Member]
Total	4,366	4,746
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Corporate debt obligations	505	500
Fair Value, Recurring [Member] \| Residential Mortgage-Backed Securities [Member]
Residential mortgage-backed securities	3,861	4,246
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Total	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt Securities [Member]
Corporate debt obligations	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Residential Mortgage-Backed Securities [Member]
Residential mortgage-backed securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Total	4,366	4,746
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Corporate debt obligations	505	500
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage-Backed Securities [Member]
Residential mortgage-backed securities	3,861	4,246
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Total	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Corporate debt obligations	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Residential Mortgage-Backed Securities [Member]
Residential mortgage-backed securities	$ 0	$ 0