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Note 15 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	406,151	1,179,456
Gross Proceeds from Stock Options Exercised	$ 756,513	$ 2,434,887
Preferred Stock, Shares Authorized	5,000,000	5,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.00001	$ 0.00001
Preferred Stock, Shares Outstanding, Ending Balance	0	0
Stock Repurchased During Period, Value	$ 2,171,022	$ 725,445
Share Buyback Program [Member]
Stock Repurchase Program, Authorized Amount			$ 5,000,000	$ 4,000,000
Stock Repurchased and Retired During Period, Shares	788,425	286,746
Stock Repurchased During Period, Value	$ 2,171,022	$ 725,445
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	156,115	125,000

X

- Definition

Amount of gross proceeds including cash proceeds and increase accounts receivable from exercise of stock options granted under share-based compensation arrangement.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Number of share options (or share units) exercised during the current period.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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