Note 5 - Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands		Sep. 30, 2026	Dec. 31, 2025
Cash and cash equivalents		$ 89,157	$ 41,353
Cash and Cash Equivalents [Member]
Cash and cash equivalents	[1],[2]	86,596	41,317
Equity Securities [Member]
Cash and cash equivalents		41	36
Marketable Securities [Member]
Cash and cash equivalents		41	36
Convertible Promissory Note Receivable [Member]
Cash and cash equivalents	[3]	2,520	0
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents		86,637	41,353
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Cash and cash equivalents	[1],[2]	86,596	41,317
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Cash and cash equivalents		41	36
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member]
Cash and cash equivalents		41	36
Fair Value, Inputs, Level 1 [Member] | Convertible Promissory Note Receivable [Member]
Cash and cash equivalents	[3]	0	0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents		0	0
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Cash and cash equivalents	[1],[2]	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Cash and cash equivalents		0	0
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member]
Cash and cash equivalents		0	0
Fair Value, Inputs, Level 2 [Member] | Convertible Promissory Note Receivable [Member]
Cash and cash equivalents	[3]	0	0
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents		2,520	0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Cash and cash equivalents	[1],[2]	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Cash and cash equivalents		0	0
Fair Value, Inputs, Level 3 [Member] | Marketable Securities [Member]
Cash and cash equivalents		0	0
Fair Value, Inputs, Level 3 [Member] | Convertible Promissory Note Receivable [Member]
Cash and cash equivalents	[3]	$ 2,520	$ 0

[1] As of September 30, 2026 and December 31, 2025, included investments in money market mutual funds managed or advised by GAMCO Investors, Inc.

[2] Excludes cash held in banks, which totaled $334 and $197 as of September 30, 2026 and December 31, 2025, respectively.

[3] Because we elected the fair value option on the Skyline Note, accrued interest of $56 is included in its fair value of $2,520 above. On the Condensed Consolidated Balance Sheets, $2,464 is presented in Convertible promissory note, at fair value and $56 of accrued interest is presented in Other assets.