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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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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

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