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Note 6 - Investments (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
shares
Mar. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
shares
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0       $ 0   $ 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 203       203   181
Long-Term Debt, Gross $ 48,917       $ 48,917   $ 46,296
Private Company [Member]              
Equity Method Investment, Other than Temporary Impairment 0 $ 0     0 $ 0  
Limited Liability Investments [Member]              
Equity Method Investments 700       700   800
Equity Method Investment, Other than Temporary Impairment 0 $ 0     0 $ 0  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 0       0    
Argo Holdings [Member]              
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 0       0    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 2,900       2,900   3,500
Net Lease [Member] | Notes Payable [Member]              
Proceeds from Issuance of Debt       $ 5,200      
Long-Term Debt, Gross     $ 15,800        
Proceeds from Collection of Lease Receivables     $ 8,100        
Private Company Investments [Member]              
Investment Owned, Fair Value $ 900       $ 900   $ 900
Common Stock [Member] | Limbach Holdings, Inc. [Member]              
Investment Owned, Balance, Shares (in shares) | shares   110,036 400,000     110,036