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Note 15 - Share-based Compensation - Stock Options Outstanding (Details)	6 Months Ended
	Mar. 31, 2020 $ / shares shares
Number Outstanding (in shares) | shares	3,103,558
Weighted Average Remaining Contractual Life (Year)	4 years 160 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.48
Number Exercisable (in shares) | shares	1,495,857
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.98
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	673,862
Weighted Average Remaining Contractual Life (Year)	2 years 292 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.69
Number Exercisable (in shares) | shares	628,455
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.68
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	1,031,250
Weighted Average Remaining Contractual Life (Year)	3 years 324 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.99
Number Exercisable (in shares) | shares	562,500
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.99
Range Three [Member]
Lower Exercise Price (in dollars per share)	2.02
Upper Exercise Price (in dollars per share)	$ 3.17
Number Outstanding (in shares) | shares	264,719
Weighted Average Remaining Contractual Life (Year)	1 year 197 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.46
Number Exercisable (in shares) | shares	263,187
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.46
Range Four [Member]
Lower Exercise Price (in dollars per share)	3.39
Upper Exercise Price (in dollars per share)	$ 3.40
Number Outstanding (in shares) | shares	1,133,727
Weighted Average Remaining Contractual Life (Year)	6 years 215 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.39
Number Exercisable (in shares) | shares	41,715
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.40

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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
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- Definition

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.

+ References

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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.

+ References

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The ceiling 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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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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- Definition

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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