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5) Stock-based Compensation: Schedule of stock inventive plan changes (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Common Class A        
Shares, Outstanding 1,012,306 842,738 1,011,274 880,426
Shares outstanding $ 4.49 $ 4.48 $ 4.49 $ 4.35
Shares Granted 2,000 0    
Shares Exercised (968) (31,984)    
Shares Cancelled 0 (5,704)    
Options Exercisable 898,472 744,686    
Options exercisable $ 4.36 $ 4.40    
Available options for future grant $ 295,128 $ 421,241    
Weighted average contractual term of options outstanding 5.89 years 6.55 years    
Weighted average contractual term of options exercisable 5.71 years 6.53 years    
Aggregated intrinsic value of options outstanding $ 704,498 $ 850,528    
Aggregated intrinsic value of options exercisable $ 704,498 $ 836,882    
Common Class C        
Shares, Outstanding 577,280 523,603 577,280 523,603
Shares outstanding $ 5.15 $ 5.24 $ 5.15 $ 5.24
Shares Granted 0 0    
Shares Exercised 0 0    
Shares Cancelled 0 0    
Options Exercisable 506,404 468,477    
Options exercisable $ 5.13 $ 5.29    
Available options for future grant $ 146,425 $ 165,638    
Weighted average contractual term of options outstanding 3.71 years 3.19 years    
Weighted average contractual term of options exercisable 2.87 years 2.43 years    
Aggregated intrinsic value of options outstanding $ 137,424 $ 251,961    
Aggregated intrinsic value of options exercisable $ 137,424 $ 232,667