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Note 6 - Investments (Details Textual)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 196   208
Long-Term Debt, Gross $ 46,557   $ 125,308
Private Company [Member]      
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI, Total 0 $ 0  
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings 0 0  
Limited Liability Investments [Member]      
Equity Method Investments 949   983
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 0    
Net Lease [Member]      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 11,700   17,100
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount 0    
Net Lease [Member] | Notes Payable [Member]      
Long-Term Debt, Gross 15,800    
Private Company Investments [Member]      
Investment Owned, at Fair Value 800   $ 800
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings $ 0 $ 0