Accounting Policies (Details - Schedule of investments - certificates of deposit) - Certificates of Deposit [Member] $ in Thousands	6 Months Ended
	Jun. 28, 2025 USD ($)
Investments [Member]
Property, Plant and Equipment [Line Items]
Investment date	Jan. 30, 2025
Maturity date	Jul. 31, 2025
Interest rate	4.38%
Investment amount	$ 10,000,000
Investments 1 [Member]
Property, Plant and Equipment [Line Items]
Investment date	Oct. 03, 2024
Maturity date	Oct. 02, 2025
Interest rate	3.05%
Investment amount	$ 10,000,000
Investments 2 [Member]
Property, Plant and Equipment [Line Items]
Investment date	Apr. 03, 2025
Maturity date	Oct. 02, 2025
Interest rate	4.02%
Investment amount	$ 9,000,000
Investments 3 [Member]
Property, Plant and Equipment [Line Items]
Investment amount	$ 4,794,000
Investment date description	Various 2025
Maturity date description	Various 2025
Investments 3 [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Interest rate	4.00%
Investments 3 [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Interest rate	4.40%