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5) Stock-based Compensation: Schedule of stock inventive plan changes (Details) - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Common Class A          
Shares, Outstanding 997,946   1,011,274 842,738 880,426
Shares outstanding $ 4.50   $ 4.49 $ 4.48 $ 4.35
Shares Granted 2,000 0      
Shares Exercised (15,328) (31,984)      
Shares Cancelled 0 (5,704)      
Options Exercisable 921,895     777,373  
Options exercisable $ 4.42     $ 4.42  
Available options for future grant $ 299,351 $ 421,241      
Weighted average contractual term of options outstanding 5.65 years 6.30 years      
Weighted average contractual term of options exercisable 5.53 years 6.29 years      
Aggregated intrinsic value of options outstanding $ 822,875     $ 873,372  
Aggregated intrinsic value of options exercisable $ 822,875     $ 862,976  
Common Class C          
Shares, Outstanding 577,280   577,280 523,603 523,603
Shares outstanding $ 5.15   $ 5.15 $ 5.24 $ 5.24
Shares Granted 0 0      
Shares Exercised 0 0      
Shares Cancelled 0 0      
Options Exercisable 530,030     486,853  
Options exercisable $ 5.14     $ 5.27  
Available options for future grant $ 146,425 $ 165,638      
Weighted average contractual term of options outstanding 3.46 years 2.94 years      
Weighted average contractual term of options exercisable 2.93 years 2.45 years      
Aggregated intrinsic value of options outstanding $ 218,010     $ 267,943  
Aggregated intrinsic value of options exercisable $ 218,010     $ 253,243