Note 4 - Investments - Net Gain (Losses) (Details) - USD ($) $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2024	[2]	Sep. 30, 2024	[2]	Jun. 30, 2024	[2]	Mar. 31, 2024	[2]	Dec. 31, 2023	[2]	Sep. 30, 2023	[2]	Jun. 30, 2023	[2]	Mar. 31, 2023	[2]	Dec. 31, 2024	Dec. 31, 2023
Marketable securities (a)	[1]																	$ (5)	$ 384
Net (losses) gains		$ 1		$ (2)		$ (1)		$ (3)		$ 0		$ (4)		$ 43		$ 345		$ (5)	$ 384

[1] During 2023, the Company sold its investments in mutual funds managed by GAMCO Investors, Inc. as well as 198,250 shares of IronNet, Inc.

[2] During Q1 and Q2 2023, the net gains primarily relate to the sale of our investments in mutual funds managed by GAMCO Investors, Inc.