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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, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Basic [Abstract]
Net income to common shareholders									$ 24,020	$ 16,721	$ 14,167
Denominator – weighted average common shares outstanding (shares)									8,318,928	7,334,577	7,136,690
Basic net income per common share (in dollars per share)	$ 0.76	$ 0.71	$ 0.74	$ 0.68	$ 0.60	$ 0.60	$ 0.58	$ 0.49	$ 2.89	$ 2.28	$ 1.99
Diluted net income per common share computation
Effect of dilutive stock options (shares)									149,298	191,767	163,773
Effect of dilutive stock warrant (shares)									0	0	79,590
Weighted average common shares outstanding-assuming dilution (shares)									8,468,226	7,526,344	7,380,053
Diluted net income per common share (in dollars per share)	$ 0.75	$ 0.70	$ 0.72	$ 0.66	$ 0.59	$ 0.59	$ 0.57	$ 0.48	$ 2.84	$ 2.22	$ 1.92

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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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