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Note 6 - Investments (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
shares
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0       $ 0   $ 0  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 155       155   181  
Long-Term Debt, Gross $ 60,282       $ 60,282   $ 46,296  
Limbach Holdings, Inc. [Member]                
Gain (Loss) on Investments           $ 3,300    
Private Company [Member]                
Equity Method Investment, Other-than-Temporary Impairment 0 $ 100     0 $ 100    
Limited Liability Investments [Member]                
Equity Method Investment, Other-than-Temporary Impairment 0 $ 100     0      
Equity Method Investments 700       700   800  
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 2,700       2,700   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 $ 700       $ 700   $ 900  
Common Stock [Member] | Limbach Holdings, Inc. [Member]                
Investment Owned, Balance, Shares (in shares) | shares     400,000         110,036