Note 7 - Employee Retirement Benefit Plans: Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Text Block [Abstract]
Interest cost	$ 136	$ 156
Amortization of actuarial loss	81	75
Amortization of prior year service cost	0	0
Net periodic benefit cost	$ 217	$ 231