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Note 6 - Investments (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
shares
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 205     205   208
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount $ 95   $ (0) $ 95 $ (0)  
Long-Term Debt, Gross $ 44,981     $ 44,981   $ 125,308
Limbach Holdings, Inc. Warrants [Member]            
Class of Warrant or Right, Outstanding (in shares) | shares 400,000     400,000    
Stock Issued During Period, Shares, Exercise of Warrants (in shares) | shares 110,036          
Private Company [Member]            
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI, Total $ 0   0 $ 0 0  
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings 0   0 0 0  
Limited Liability Investments [Member]            
Equity Method Investments 899     899   983
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 0     0    
Limited Liability Investments [Member] | Net Lease [Member]            
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 0     0    
Net Lease and Argo Holding [Member]            
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 3,700     3,700   17,100
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount 100     100    
Net Lease and Argo Holding [Member] | Maximum [Member]            
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount     $ 100   100  
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, at Fair Value $ 800     800   $ 800
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings       $ 0 $ 0