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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

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