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Fair value measurements (Fair Value, Warrants Measured on Recurring Basis) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Fair value of warrants at beginning of year	$ 103
Unrealized gain (loss) on fair value adjustment for warrants	(4)
Fair value of warrants at end of year	99
Fair Value, Inputs, Level 3 [Member]
Fair value of warrants at beginning of year	103
Fair value of warrants at end of year	$ 99

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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