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Note 16 - Share-based Compensation - Stock Options Outstanding (Details)	3 Months Ended
	Dec. 31, 2020 $ / shares shares
Number Outstanding (in shares) | shares	2,754,281
Weighted Average Remaining Contractual Life (Year)	4 years 153 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.92
Number Exercisable (in shares) | shares	1,500,749
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.08
Weighted Average Exercise Price, Exercisable (in dollars per share)	2.08
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	373,054
Weighted Average Remaining Contractual Life (Year)	2 years 233 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.66
Number Exercisable (in shares) | shares	351,460
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.66
Weighted Average Exercise Price, Exercisable (in dollars per share)	1.66
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)	3 years 65 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, 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	95,000
Weighted Average Remaining Contractual Life (Year)	332 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.42
Number Exercisable (in shares) | shares	95,000
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.42
Weighted Average Exercise Price, Exercisable (in dollars per share)	2.42
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)	5 years 302 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.39
Number Exercisable (in shares) | shares	104,289
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.40
Weighted Average Exercise Price, Exercisable (in dollars per share)	3.40
Range Five [Member]
Lower Exercise Price (in dollars per share)	6.87
Upper Exercise Price (in dollars per share)	$ 6.87
Number Outstanding (in shares) | shares	215,000
Weighted Average Remaining Contractual Life (Year)	6 years 343 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 6.87
Number Exercisable (in shares) | shares	12,500
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 6.87
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 6.87

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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- 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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- Definition

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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- 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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