Note 7 - Employee Retirement Benefit Plans: Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Text Block [Abstract]
Interest cost	$ 148	$ 136
Amortization of actuarial loss	78	81
Amortization of prior year service cost	0	0
Net periodic benefit cost	$ 226	$ 217