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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic [Abstract]
Net income to common shareholders									$ 24,269	$ 24,020	$ 16,721
Denominator – weighted average common shares outstanding (shares)									8,326,600	8,318,928	7,334,577
Basic net income per common share (in dollars per share)	$ 0.76	$ 0.75	$ 0.61	$ 0.80	$ 0.76	$ 0.71	$ 0.74	$ 0.68	$ 2.91	$ 2.89	$ 2.28
Diluted net income per common share computation
Effect of dilutive stock options (shares)									95,886	149,298	191,767
Weighted average common shares outstanding-assuming dilution (shares)									8,422,486	8,468,226	7,526,344
Diluted net income per common share (in dollars per share)	$ 0.76	$ 0.74	$ 0.60	$ 0.78	$ 0.75	$ 0.70	$ 0.72	$ 0.66	$ 2.88	$ 2.84	$ 2.22

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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