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Income taxes - Reconciliation of Company's Actual Tax Rate to U.S. Federal Statutory Rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income tax rates    
- Statutory U.S. federal rate 21.00% 21.00%
- State income taxes, net of federal benefit 0.00% 0.00%
- Excess tax benefits related to stock compensation (4.00%) 0.00%
- AMT credit and NOL Carryback 0.00% 8.00%
PPP Benefit 2.00% 0.00%
- Lobbying 0.00% (1.00%)
- Meals & Entertainment 0.00% (1.00%)
- Officer's Life Insurance 0.00% 4.00%
- Change in valuation allowance (12.00%) (28.00%)
Total 3.00% 3.00%