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Income Taxes, Statutory to Effective Income Tax Reconciliation (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statutory to Effective Income Tax Reconciliation [Abstract]          
Statutory rates applied to income before income taxes     $ 16,164,000 $ 6,032,000 $ 8,486,000
State income taxes, net of Federal tax benefit     2,057,000 1,149,000 1,616,000
Net permanent differences     520,000 228,000 220,000
Other     48,000 (128,000) (218,000)
Leases   $ (400,000) 0 (418,000) 0
State tax credits $ (1,200,000)   (1,206,000) (4,000) (3,000)
Income tax expense     17,583,000 6,859,000 10,101,000
State quality jobs credits     $ 1,527,000 $ 1,527,000 $ 1,527,000