13) Stock Compensation Plans: Schedule of stock inventive plan changes (Details) - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Common Class A
Shares, Outstanding, beginning		1,086,053	1,011,274
Adjustment for effect of stock dividends		27,968	51,018
Shares Granted		77,000	81,000
Shares Exercised		(116,487)	(45,834)
Shares Cancelled		(1,671)	(11,405)
Shares, Outstanding, ending		1,072,863	1,086,053
Shares outstanding, beginning		$ 4.41	$ 4.49
Per Share Shares Granted		0.00	0.00
Per Share Shares Exercised		0.00	0.00
Per Share Shares cancelled		0.00	0.00
Shares, Outstanding, ending		$ 4.33	$ 4.41
Options Exercisable		1,053,903
Available options for future grant		$ 325,372
Weighted average contractual term of options outstanding		P5Y6M
Weighted average contractual term of options exercisable		P5Y5M5D
Aggregated intrinsic value of options outstanding	[1]	$ 4,311,983
Aggregated intrinsic value of options exercisable	[1]	$ 4,223,251
Common Class C
Shares, Outstanding, beginning		594,132	577,280
Adjustment for effect of stock dividends		19,354	28,295
Shares Granted		180,000	180,000
Shares Exercised		(130,820)	(191,443)
Shares Cancelled		0	0
Shares, Outstanding, ending		662,666	594,132
Shares outstanding, beginning		$ 5.36	$ 5.15
Per Share Shares Granted		0.00	0.00
Per Share Shares Exercised		0.00	0.00
Per Share Shares cancelled		0.00	0.00
Shares, Outstanding, ending		$ 4.73	$ 5.36
Options Exercisable		616,542
Available options for future grant		$ 266,500
Weighted average contractual term of options outstanding		P6Y8M16D
Weighted average contractual term of options exercisable		P6Y7M17D
Aggregated intrinsic value of options outstanding	[1]	$ 2,396,954
Aggregated intrinsic value of options exercisable	[1]	$ 2,183,399

[1] The Company used a stock price of $8.35 as of December 31, 2020 to derive intrinsic value.