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Debt (Narrative) (Details)			6 Months Ended	9 Months Ended
	Aug. 18, 2025 USD ($)	Dec. 29, 2021 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) item	Dec. 31, 2024 USD ($)	Jul. 01, 2022	Apr. 13, 2020 USD ($)
Short-term Debt [Line Items]
Number of equal monthly installments of principal and interest | item				60
Pettyjohn, Wood & White, Inc [Member]
Short-term Debt [Line Items]
Percentage of capital stock purchased				100.00%
National Bank of Blacksburg (NBB Note) [Member]
Short-term Debt [Line Items]
Proceeds from Issuance of Debt		$ 11,000,000
Debt instrument, interest rate, stated percentage	5.65%	4.00%				3.90%
Debt instrument amortization period				15 years
Debt monthly installments of principal and interest	$ 61,800
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	7,410,000	$ 9,375,000
Option for prepayment of principal	$ 1,000,000
Percentage of common stock secured by first priority lien				4.95%
Capital notes, principal balance				$ 8,800,000
2020 Offering [Member]
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage							3.25%
Capital notes, maturity date			Jun. 30, 2025
Capital notes, principal balance							$ 10,050,000
Repayment of unsecured debt			$ 10,050,000
Interest payment on notes			82,000
Cash outflow for financing activities			$ 10,050,000
Loan balance, net of unamortized issuance costs				$ 0	$ 10,050,000

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