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Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase in income taxes resulting from:      
Total income tax expense $ 3,380 $ 1,736 $ 1,900
MTI      
Operating Loss Carryforwards      
"Expected" tax expense 2,223 361  
Increase in income taxes resulting from:      
State income taxes, net of federal income tax expense 382 327  
Other non-deductible items 384 472  
Other, net 91 108  
Total income tax expense $ 3,080 $ 1,268