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Note 7 - Investments (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 29, 2022
USD ($)
Mar. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
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     208 181 208  
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount       $ 229 $ (0)  
Long-Term Debt, Gross     $ 125,308 46,296 125,308  
Proceeds from Sale of Real Estate Held-for-investment, Total       0 12,150  
Limbach Holdings, Inc. [Member]            
Gain (Loss) on Investments       3,300    
Flower [Member]            
Proceeds from Sale of Real Estate Held-for-investment, Total $ 12,200          
Notes Payable, Total $ 5,900          
Gains (Losses) on Sales of Investment Real Estate         1,500  
Private Company [Member]            
Equity Method Investment, Other than Temporary Impairment       0 0  
Limited Liability Investments [Member]            
Equity Method Investments     1,000 800 1,000  
Equity Method Investment, Other than Temporary Impairment       100 0  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments       0    
Limited Liability Investments [Member] | Net Lease [Member]            
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures       0    
Net Lease and Argo Holding [Member]            
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures     17,100 3,500 17,100  
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount       100    
Net Lease and Argo Holding [Member] | Maximum [Member]            
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount         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, Fair Value     $ 800 900 800  
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI       $ 100 $ 100  
Warrant [Member] | Limbach Holdings, Inc. [Member]            
Investment Owned, Balance, Shares (in shares) | shares   400,000        
Common Stock [Member] | Limbach Holdings, Inc. [Member]            
Investment Owned, Balance, Shares (in shares) | shares           110,036