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Income taxes - Reconciliation of the Company's actual tax rate to the U.S. Federal statutory rate (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax rates      
- Statutory U.S. federal rate 21.00% 21.00% 21.00%
- State income taxes, net of federal benefit 4.00% 4.00% 0.00%
- Excess tax benefits related to stock compensation (1.00%) (1.00%) (4.00%)
- 162m limitation 1.00% 1.00%
- PPP Benefit 0.00% 0.00% (2.00%)
- Valuation allowance 0.00% 13.00% 12.00%
- Other true-up 0.00% (1.00%)
Total 25.00% 11.00% 3.00%
Domestic Tax Authority [Member]      
Income tax rates      
Operating loss carryforwards $ 0 $ 0  
State      
Income tax rates      
Operating loss carryforwards $ 1,800,000