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Note 6 - Investments (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2023 shares | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 209 |  |  | 209 |  |  | 208
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | $ 71 |  | $ (0) | $ 166 | $ (0) |  |
Long-Term Debt, Gross | 43,756 |  |  | 43,756 |  |  | $ 125,308
Limbach Holdings, Inc. [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments | 3,300 |  |  |  |  |  |
Private Company [Member] |  |  |  |  |  |  |
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI | 100 |  | 0 | 100 | 0 |  |
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings | 0 |  | 0 | 0 | 0 |  |
Limited Liability Investments [Member] |  |  |  |  |  |  |
Equity Method Investments | 816 |  |  | 816 |  |  | 983
Equity Method Investment, Other than Temporary Impairment | 100 |  | 0 | 100 | 0 |  |
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 | 3,600 |  |  | 3,600 |  |  | 17,100
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | 0 |  | $ 0 | 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 | $ 900 |  |  | 900 |  |  | $ 800
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings |  |  |  | $ 100 | $ 0 |  |
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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