Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Details
Net income	$ 2,933	$ 3,705	$ 7,386	$ 10,369
Weighted average shares, basic	3,642	3,720	3,664	3,722
Dilutive effect of stock options	11	17	14	16
Diluted shares	3,653	3,737	3,678	3,738
Earnings per share, basic	$ 0.81	$ 1.00	$ 2.02	$ 2.79
Earnings per share, diluted	$ 0.80	$ 0.99	$ 2.01	$ 2.77