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Reconciliation between the amount of tax shown above and the amount computed at the statutory Federal income tax (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]        
  Federal rate   $ 7,941,000 $ 3,226,000 $ 5,006,000
State income taxes (net of Federal   income tax benefit)   2,634,000 1,048,000 1,623,000
Carryback of net operating loss $ (1,100,000) 0 (1,100,000) 0
Other, net   (503,000) (59,000) (523,000)
Provision for income taxes   $ 10,072,000 $ 3,115,000 $ 6,106,000