5) Stock Compensation Plans: Schedule of stock inventive plan changes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020		Dec. 31, 2020	Dec. 31, 2019
Common Class A
Shares, Outstanding	1,039,938		1,082,088		1,072,863	1,086,053
Shares outstanding	$ 4.34		$ 4.44		$ 4.33	$ 4.41
Adjustment for effect of stock dividends	0		829
Shares Granted	0		37,500
Shares Exercised	(32,925)		(42,294)
Shares Cancelled	0		0
Options Exercisable	1,039,938		985,366
Options exercisable	$ 4.34		$ 4.42
Available options for future grant	$ 330,371		$ 97,218
Weighted average contractual term of options outstanding	6 years 3 months 11 days		5 years 6 months 25 days
Weighted average contractual term of options exercisable	6 years 3 months 11 days		5 years 1 month 27 days
Aggregated intrinsic value of options outstanding	$ 5,212,677	[1]	$ 489,237	[2]
Aggregated intrinsic value of options exercisable	$ 5,212,677	[1]	$ 471,642	[2]
Common Class C
Shares, Outstanding	662,666		684,132		662,666	594,132
Shares outstanding	$ 4.73		$ 5.15		$ 4.73	$ 5.36
Adjustment for effect of stock dividends	0		594,132
Shares Granted	0		0
Shares Exercised	0		90,000
Shares Cancelled	0		0
Options Exercisable	662,666		452,381
Options exercisable	$ 4.73		$ 5.39
Available options for future grant	$ 266,500		$ 0
Weighted average contractual term of options outstanding	6 years 8 months 16 days		5 years 11 months 15 days
Weighted average contractual term of options exercisable	6 years 8 months 16 days		4 years 8 months 12 days
Aggregated intrinsic value of options outstanding	$ 3,059,620	[1]	$ 41,150	[2]
Aggregated intrinsic value of options exercisable	$ 3,059,620	[1]	$ 0	[2]

[1] The Company used a stock price of $9.35 as of March 31, 2021 to derive intrinsic value.

[2] The Company used a stock price of $4.27 as of March 31, 2020 to derive intrinsic value.