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Note 14 - Share-based Compensation - Stock Options Outstanding (Details)	6 Months Ended
	Mar. 31, 2019 $ / shares shares
Number Outstanding (in shares) | shares	2,598,242
Number Exercisable (in shares) | shares	1,702,145
Range One [Member]
Lower Exercise Price (in dollars per share)	$ 0.93
Upper Exercise Price (in dollars per share)	$ 1.69
Number Outstanding (in shares) | shares	577,766
Weighted Average Remaining Contractual Life (Year)	4 years 73 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.57
Number Exercisable (in shares) | shares	560,545
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.57
Range Two [Member]
Lower Exercise Price (in dollars per share)	1.71
Upper Exercise Price (in dollars per share)	$ 1.86
Number Outstanding (in shares) | shares	525,226
Weighted Average Remaining Contractual Life (Year)	3 years 105 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.80
Number Exercisable (in shares) | shares	461,257
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.81
Range Three [Member]
Lower Exercise Price (in dollars per share)	1.99
Upper Exercise Price (in dollars per share)	$ 1.99
Number Outstanding (in shares) | shares	1,125,000
Weighted Average Remaining Contractual Life (Year)	4 years 124 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.99
Number Exercisable (in shares) | shares	312,500
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.99
Range Four [Member]
Lower Exercise Price (in dollars per share)	2.02
Upper Exercise Price (in dollars per share)	$ 3.13
Number Outstanding (in shares) | shares	360,250
Weighted Average Remaining Contractual Life (Year)	2 years 215 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.55
Number Exercisable (in shares) | shares	357,843
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.55
Range Five [Member]
Lower Exercise Price (in dollars per share)	3.17
Upper Exercise Price (in dollars per share)	$ 3.17
Number Outstanding (in shares) | shares	10,000
Weighted Average Remaining Contractual Life (Year)	2 years 233 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.17
Number Exercisable (in shares) | shares	10,000
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.17

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=116856206&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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- 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

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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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