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Overview and Summary of Significant Accounting Policies (Details 2) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Overview and Summary of Significant Accounting Policies        
Basic 13,482,303 13,573,086 13,461,252 13,551,507
Dilutive effects of stock options 139,635 1,777 126,333 2,112
Weighted average number of common shares used in diluted net income per common share 13,621,938 13,574,863 13,587,585 13,553,619