Note 6 - Commitments and Contingencies (Details Textual) - Indemnity Agreement [Member] - USD ($)	Oct. 27, 2022	Dec. 21, 2021
Debt Instrument, Maximum Reimbursement and Indemnification Amount		$ 5,000,000
Debt Instrument, Additional Reimbursement and Indemnification Amount	$ 700,000

Additional amount of reimbursement and indemnification under debt instrument.

No definition available.

Name:	cphc_DebtInstrumentAdditionalReimbursementAndIndemnificationAmount
Namespace Prefix:	cphc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant