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Note 14 - Share-based Compensation - Stock Options Outstanding (Details)	12 Months Ended
	Sep. 30, 2018 $ / shares shares
Range One [Member]
Lower Exercise Price (in dollars per share)	$ 0.93
Upper Exercise Price (in dollars per share)	$ 1.76
Number Outstanding (in shares) | shares	912,966
Weighted Average Remaining Contractual Life (Year)	5 years 102 days
Weighted Average Exercise Price (in dollars per share)	$ 1.63
Number Exercisable (in shares) | shares	783,059
Weighted Average Exercise Price (in dollars per share)	$ 1.62
Range Two [Member]
Lower Exercise Price (in dollars per share)	1.77
Upper Exercise Price (in dollars per share)	$ 1.99
Number Outstanding (in shares) | shares	1,346,642
Weighted Average Remaining Contractual Life (Year)	5 years 54 days
Weighted Average Exercise Price (in dollars per share)	$ 1.97
Number Exercisable (in shares) | shares	471,642
Weighted Average Exercise Price (in dollars per share)	$ 1.93
Range Three [Member]
Lower Exercise Price (in dollars per share)	2
Upper Exercise Price (in dollars per share)	$ 2.85
Number Outstanding (in shares) | shares	364,000
Weighted Average Remaining Contractual Life (Year)	3 years 29 days
Weighted Average Exercise Price (in dollars per share)	$ 2.55
Number Exercisable (in shares) | shares	360,500
Weighted Average Exercise Price (in dollars per share)	$ 2.55
Range Four [Member]
Lower Exercise Price (in dollars per share)	2.86
Upper Exercise Price (in dollars per share)	$ 3.17
Number Outstanding (in shares) | shares	771,250
Weighted Average Remaining Contractual Life (Year)	120 days
Weighted Average Exercise Price (in dollars per share)	$ 3
Number Exercisable (in shares) | shares	769,375
Weighted Average Exercise Price (in dollars per share)	$ 3
Range Five [Member]
Lower Exercise Price (in dollars per share)	3.14
Upper Exercise Price (in dollars per share)	$ 3.17
Number Outstanding (in shares) | shares	3,394,858
Weighted Average Remaining Contractual Life (Year)
Weighted Average Exercise Price (in dollars per share)
Number Exercisable (in shares) | shares	2,384,576
Weighted Average Exercise Price (in dollars per share)

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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.

+ References

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