Liquidity And Impairment Assessment (Narrative) (Details) - USD ($)			1 Months Ended	6 Months Ended
	May 21, 2025	Feb. 05, 2025	Jan. 31, 2025	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Liquidity And Impairment Assessment [Line Items]
Borrowings due				$ 172,184,000		$ 201,826,000
Debt current				38,200,000
Cash and cash equivalents, Book Value				11,955,000	$ 10,727,000	15,082,000	$ 15,441,000
Working capital				(109,200,000)
Impairment charges against sites				0
Repayment of long-term borrowings				33,843,000	$ 11,391,000
Westpac Bank Corporate Credit Facility [Member]
Liquidity And Impairment Assessment [Line Items]
Borrowings due						10,543,000
Repayment of long-term borrowings			$ 10,700,000
Bank Of America Credit Facility [Member]
Liquidity And Impairment Assessment [Line Items]
Borrowings due		$ 8,700,000		7,173,000		14,699,000
Repayment of long-term borrowings		$ 6,100,000
NAB Bridge Facility [Member]
Liquidity And Impairment Assessment [Line Items]
Borrowings due						$ 12,361,000
Repayment of long-term borrowings	$ 12,900,000
Nine Property Assets [Member]
Liquidity And Impairment Assessment [Line Items]
Sale price				$ 201,500,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Cannon Park ETC [Member]
Liquidity And Impairment Assessment [Line Items]
Sale price	20,700,000
Core Facility [Member]
Liquidity And Impairment Assessment [Line Items]
Repayment of long-term borrowings	$ 970,000