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Note 15 - Share-based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Number of Shares Outstanding, Beginning Balance (in shares)	2,219,268
Weighted Average Exercise Price, Shares Outstanding, Beginning Balance (in dollars per share)	$ 1.94
Number of Shares Granted (in shares)	1,133,727	0
Weighted Average Exercise Price, Shares Granted (in dollars per share)	$ 3.39
Number of Shares Forfeited/expired (in shares)	(110,671)
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share)	$ 2.11
Number of Shares Exercised (in shares)	(583,019)	(406,151)
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 1.95
Number of Shares Outstanding, Ending Balance (in shares)	2,659,305	2,219,268
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share)	$ 2.56	$ 1.94
Number of Shares Exercisable (in shares)	1,110,789
Weighted Average Exercise Price, Shares Exercisable (in dollars per share)	$ 2.03

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Section 50
-Paragraph 2
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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