Income taxes - net of refunds (Details)	12 Months Ended
Dec. 31, 2025 USD ($)
Income taxes
United States refunds	$ 1,989,000
Net Payment	2,367,076
State
Income taxes
States and Local refunds	203,000
Other States
Income taxes
States and Local refunds	$ 175,076

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Amount, after income tax refund received, of cash paid to federal (national) tax jurisdiction for tax on income.

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Amount, after income tax refund received, of cash paid to state and local tax jurisdictions for tax on income.

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Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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