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11) Retirement Plans: 401(k) Plans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plan, Description The Company has three 401(k) savings plans covering all eligible employees, as defined above, which includes employer participation in accordance with the provisions of Section 401(k) of the Internal Revenue Code. The plans allow participants to make pretax contributions up to a maximum of $18,500 and $18,000 for the years 2018 and 2017, respectively or the statutory limits.  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount $ 18,500 $ 18,000
Benefit plans funded with treasury stock 1,480,913 1,534,861
Safe Harbor Plan    
Benefit plans funded with treasury stock $ 1,480,913 $ 1,534,861