3.Changes in Accumulated Other Comprehensive Loss: Schedule of Components of Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Details
Other Comprehensive Income, Before Tax Amount	$ (141)	$ (81)	$ (73)	$ (96)
Other Comprehensive Income, Taxes	30	28	16	33
Other Comprehensive Income, Net of Tax Amount	(111)	(53)	$ (57)	$ (63)
Other comprehensive loss, net, before tax amount	(68)	15
Unrealized holding gain arising during period, taxes	14	(5)
Unrealized holding gain arising during period, net of tax amount	(54)	10
Other comprehensive income loss, net, tax (expense) benefit	14	(5)
Other comprehensive income loss, net, net after tax amount	$ (54)	$ 10