Debt: Notes Payable (Details) - Note Agreement - USD ($)	3 Months Ended
	Mar. 26, 2022	Dec. 31, 2022	Sep. 30, 2021	May 31, 2015
Notes Payable.
Notes Payable
Principal amount outstanding	$ 46,600,000
Minimum prepayment	1,000,000.0
Series A Notes
Notes Payable
Principal amount outstanding	$ 9,700,000
Note payable, face amount				$ 25,000,000.0
Term of notes payable	10 years
Interest rate (as a percent)	5.50%
Quarterly principal payment, first five years	$ 500,000
Quarterly principal payment, thereafter	750,000
Series B Notes
Notes Payable
Principal amount outstanding	$ 6,900,000
Note payable, face amount		$ 12,500,000
Term of notes payable	10 years
Interest rate (as a percent)	5.10%
Quarterly principal payment	$ 312,500
Series C Notes
Notes Payable
Principal amount outstanding	$ 30,000,000.0
Note payable, face amount			$ 30,000,000.0
Term of notes payable	7 years
Interest rate (as a percent)	3.18%