Income Taxes - Provision for income taxes (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Taxes currently payable	$ 768,496	$ 68,865
Deferred income taxes	51,470	18,829
Income tax expense	$ 819,966	$ 87,694

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Name:	us-gaap_DeferredIncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration