Income Taxes - Income tax expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Taxes
Federal	$ 76,100	$ 43,160	$ 132,100	$ 131,002
State and local	7,300	4,313	12,100	7,091
Total	$ 83,400	$ 47,473	$ 144,200	$ 138,093