v3.26.1
Note 5 - Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Cash and cash equivalents (a) (b) $ 47,204 $ 41,353
Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[2] 44,895 41,317
Restricted Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[3] 300 0
Equity Securities [Member]    
Cash and cash equivalents (a) (b) 41 36
Marketable Securities [Member]    
Cash and cash equivalents (a) (b) 41 36
Convertible Promissory Note Receivable [Member]    
Cash and cash equivalents (a) (b) 1,968 0
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents (a) (b) 45,236 41,353
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[2] 44,895 41,317
Fair Value, Inputs, Level 1 [Member] | Restricted Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[3] 300 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]    
Cash and cash equivalents (a) (b) 41 36
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member]    
Cash and cash equivalents (a) (b) 41 36
Fair Value, Inputs, Level 1 [Member] | Convertible Promissory Note Receivable [Member]    
Cash and cash equivalents (a) (b) 0 0
Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents (a) (b) 0 0
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[2] 0 0
Fair Value, Inputs, Level 2 [Member] | Restricted Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[3] 0 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]    
Cash and cash equivalents (a) (b) 0 0
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member]    
Cash and cash equivalents (a) (b) 0 0
Fair Value, Inputs, Level 2 [Member] | Convertible Promissory Note Receivable [Member]    
Cash and cash equivalents (a) (b) 0 0
Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents (a) (b) 1,968 0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[2] 0 0
Fair Value, Inputs, Level 3 [Member] | Restricted Cash and Cash Equivalents [Member]    
Cash and cash equivalents (a) (b) [1],[3] 0 0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]    
Cash and cash equivalents (a) (b) 0 0
Fair Value, Inputs, Level 3 [Member] | Marketable Securities [Member]    
Cash and cash equivalents (a) (b) 0 0
Fair Value, Inputs, Level 3 [Member] | Convertible Promissory Note Receivable [Member]    
Cash and cash equivalents (a) (b) $ 1,968 $ 0
[1] As of June 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 $220 and $197 as of June 30, 2026 and December 31, 2025, respectively.
[3] Excludes cash held in banks, which totaled $20 and $0 as of June 30, 2026 and December 31, 2025, respectively.