Cash Dividend (Details) - Series C Preferred Stock - USD ($)		6 Months Ended
	Dec. 29, 2022	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Dividend
Cash dividend (as percent)	3.00%	5.00%
Aggregated dividend amount	$ 1,274,400	$ 1,062,000
Dividend per share	$ 31.86	$ 27
Cumulative liquidation value		$ 43,545,000	$ 42,483,000	$ 2,023,000
Cumulative liquidation value (in dollars per share)		$ 1,089	$ 1,062	$ 1,062