v3.26.1
Note 5 - Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Assets, Fair Value Disclosure $ 46,008 $ 41,353
Cash and Cash Equivalents [Member]    
Assets, Fair Value Disclosure [2] 45,958 [1] 41,317
Equity Securities [Member]    
Assets, Fair Value Disclosure 50 36
Marketable Securities [Member]    
Assets, Fair Value Disclosure 50 36
Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure 46,008 41,353
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]    
Assets, Fair Value Disclosure [2] 45,958 [1] 41,317
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]    
Assets, Fair Value Disclosure 50 36
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member]    
Assets, Fair Value Disclosure 50 36
Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [2] 0 [1] 0
Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [2] $ 0 [1] $ 0
[1] As of December 31, 2025 and 2024, included investments in money market mutual funds managed or advised by GAMCO Investors, Inc. or one of its subsidiaries.
[2] As of March 31, 2026 and December 31, 2025, included investments in money market mutual funds managed or advised by GAMCO Investors, Inc.