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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Details
Net income	$ 4,206	$ 2,933	$ 10,656	$ 7,386
Weighted average shares, basic	3,647	3,642	3,645	3,664
Dilutive effect of stock options	11	11	11	14
Diluted shares	3,658	3,653	3,656	3,678
Earnings per share, basic	$ 1.15	$ 0.81	$ 2.92	$ 2.02
Earnings per share, diluted	$ 1.15	$ 0.80	$ 2.91	$ 2.01