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Note 15 - Share-based Compensation - Stock Options Outstanding (Details)	6 Months Ended
	Mar. 31, 2022 $ / shares shares
Number Outstanding (in shares) | shares	2,977,384
Weighted Average Remaining Contractual Life (Year)	3 years 8 months 19 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.23
Number Exercisable (in shares) | shares	1,575,182
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.42
Weighted Average Exercise Price, Outstanding (in dollars per share)	3.23
Weighted Average Exercise Price, Exercisable (in dollars per share)	2.42
Range One [Member]
Lower Exercise Price (in dollars per share)	1.31
Upper Exercise Price (in dollars per share)	$ 1.86
Number Outstanding (in shares) | shares	319,157
Weighted Average Remaining Contractual Life (Year)	1 year 6 months 3 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.64
Number Exercisable (in shares) | shares	319,157
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.64
Weighted Average Exercise Price, Outstanding (in dollars per share)	1.64
Weighted Average Exercise Price, Exercisable (in dollars per share)	1.64
Range Two [Member]
Lower Exercise Price (in dollars per share)	1.99
Upper Exercise Price (in dollars per share)	$ 1.99
Number Outstanding (in shares) | shares	937,500
Weighted Average Remaining Contractual Life (Year)	1 year 11 months 8 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.99
Number Exercisable (in shares) | shares	937,500
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.99
Weighted Average Exercise Price, Outstanding (in dollars per share)	1.99
Weighted Average Exercise Price, Exercisable (in dollars per share)	1.99
Range Three [Member]
Lower Exercise Price (in dollars per share)	3.39
Upper Exercise Price (in dollars per share)	$ 3.39
Number Outstanding (in shares) | shares	800,000
Weighted Average Remaining Contractual Life (Year)	4 years 6 months 3 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.39
Number Exercisable (in shares) | shares	0
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 0
Weighted Average Exercise Price, Outstanding (in dollars per share)	3.39
Weighted Average Exercise Price, Exercisable (in dollars per share)	0
Range Four [Member]
Lower Exercise Price (in dollars per share)	3.40
Upper Exercise Price (in dollars per share)	$ 4.99
Number Outstanding (in shares) | shares	635,727
Weighted Average Remaining Contractual Life (Year)	5 years 6 months 10 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 4.10
Number Exercisable (in shares) | shares	237,745
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.60
Weighted Average Exercise Price, Outstanding (in dollars per share)	4.10
Weighted Average Exercise Price, Exercisable (in dollars per share)	3.60
Range Five [Member]
Lower Exercise Price (in dollars per share)	5.05
Upper Exercise Price (in dollars per share)	$ 8.03
Number Outstanding (in shares) | shares	285,000
Weighted Average Remaining Contractual Life (Year)	5 years 9 months 18 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 6.66
Number Exercisable (in shares) | shares	80,780
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 6.94
Weighted Average Exercise Price, Outstanding (in dollars per share)	6.66
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 6.94

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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- Definition

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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