Summary of Significant Accounting Policies (Net Income Per Common 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
Accounting Policies [Abstract]
Net income	$ 4,433	$ 1,766	$ 2,004	$ 208	[1]	$ 2,286	$ 1,648	$ 1,342	$ 4,682	$ 8,411	$ 9,958	$ 1,631
Denominator for basic net income per common share — weighted average shares outstanding										28,849,000	27,905,000	27,083,000
Effect of dilutive securities:
Stock options and restricted stock units										697,000	649,000	569,000
Denominator for diluted net income per common share — adjusted weighted average shares										29,546,000	28,554,000	27,652,000
Net income per common share:
Basic	$ 0.15	$ 0.06	$ 0.07	$ 0.01		$ 0.08	$ 0.06	$ 0.05	$ 0.17	$ 0.29	$ 0.36	$ 0.06
Diluted net income per common share:
Diluted	$ 0.15	$ 0.06	$ 0.07	$ 0.01		$ 0.08	$ 0.06	$ 0.05	$ 0.17	$ 0.28	$ 0.35	$ 0.06
Antidilutive securities excluded from computation of earnings per share										1,143,411	744,513	925,063

[1] During fiscal 2020, we recorded a discrete tax benefit of $1.0 million in the first quarter of fiscal 2020 resulting from excess tax benefits recognized on stock compensation and an adjustment of our state deferred tax rate due to the Opengear acquisition.