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Stock Plans And Stock Based Compensation: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2012
Shares:      
Options outstanding, beginning of period 341,300 215,900 221,400
Options outstanding, end of period 335,600 341,300 215,900
Options exercisable, end of period 101,800   69,500
Weighted Average Exercise Price (in dollars per share):      
Options outstanding, beginning of period $ 8.73 $ 7.57 $ 7.49
Options outstanding, end of period 8.74 $ 8.73 7.57
Options exercisable, end of period $ 6.75   $ 6.18