Note 7 - Employee Retirement Benefit Plans: Schedule of Costs of Retirement Plans, changes in benefit obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Text Block [Abstract]
Projected benefit obligation as of beginning of the year	$ 4,650	$ 4,851
Interest cost	136	156
Actuarial loss (gain)	(119)	103
Benefits paid	(445)	(460)
Projected benefit obligation as of beginning of the year	4,222	4,650
Contributions	445	460
Fair value of plan assets - end of year	$ 0	$ 0