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Net Income Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income (loss)	$ (414,378)	$ (1,041,037)	$ (1,316,871)	$ (881,619)	$ (186,045)	$ 19,220	$ 5,930,425	$ (1,194,974)	$ (3,653,905)	$ 4,568,627	$ 1,986,801
Denominator:
Basic weighted average shares									16,805,991	16,742,461	16,927,055
Dilutive effect of share-based awards										113,182	112,241
Diluted weighted average shares									16,805,991	16,855,644	17,039,296
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.03)	$ (0.06)	$ (0.08)	$ (0.05)	$ (0.01)		$ 0.35	$ (0.07)	$ (0.22)	$ 0.27	$ 0.12
Diluted (in dollars per share)	$ (0.03)	$ (0.06)	$ (0.08)	$ (0.05)	$ (0.01)		$ 0.35	$ (0.07)	$ (0.22)	$ 0.27	$ 0.12
Options to purchase common stock outstanding (in shares)	550,834				586,834				550,834	586,834	589,168
Anti-dilutive options to purchase common stock excluded from the computation of diluted earnings per share (in shares)										336,961	339,581
Delta | Other income
Net income (loss) per common share:
Reminder of amount paid									$ 4,100,000	$ 4,100,000
RSU
Net income (loss) per common share:
Restricted stock units outstanding ( in shares)	0				0				0	0	0

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