6) Earnings Per Share: Share-based Payment Arrangement, Option, Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Common Class A
Common Stock, Shares, Outstanding	16,595,783	16,107,779
Exercise of stock options	27,926	22,411
Dividends		$ 404,839
Conversion of Class C to Class A	48,527	11,162
Common Stock, Shares, Outstanding	16,672,236	16,546,191
Common Class C
Common Stock, Shares, Outstanding	2,679,603	2,500,887
Exercise of stock options
Dividends		$ 61,720
Conversion of Class C to Class A	(48,527)	(11,162)
Common Stock, Shares, Outstanding	2,631,076	2,551,445