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5) Stock-based Compensation: Schedule of stock inventive plan changes (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Class A Common Stock        
Shares, Outstanding 842,738 741,973 880,426 741,973
Shares outstanding $ 4.48 $ 4.33 $ 4.35 $ 4.33
Shares Exercised (31,984)      
Shares Cancelled (5,704)      
Options Exercisable 744,686 636,764    
Options exercisable $ 4.40 $ 3.94    
Available options for future grant $ 421,241 $ 253,432    
Weighted average contractual term of options outstanding 6.55 years 7.12 years    
Weighted average contractual term of options exercisable 6.53 years 6.70 years    
Aggregated intrinsic value of options outstanding $ 850,528 $ 1,837,828    
Aggregated intrinsic value of options exercisable $ 836,882 $ 1,824,086    
Class C Common Stock        
Shares, Outstanding 523,603 556,298 523,603 556,298
Shares outstanding $ 5.24 $ 4.61 $ 5.24 $ 4.61
Options Exercisable 468,477 493,298    
Options exercisable $ 5.29 $ 4.26    
Available options for future grant $ 165,638      
Weighted average contractual term of options outstanding 3.19 years 2.42 years    
Weighted average contractual term of options exercisable 2.43 years 2.13 years    
Aggregated intrinsic value of options outstanding $ 251,961 $ 1,264,540    
Aggregated intrinsic value of options exercisable $ 232,667 $ 1,264,540