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Note 12 - Leases (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Oct. 01, 2019	Sep. 30, 2019
Increase in Lease Liability with 10% Increase in Index			$ 19,000
Operating Lease, Liability, Total	$ 7,471,329		7,471,329		$ 7,814,701
Operating Lease, Right-of-Use Asset	$ 5,534,154		$ 5,534,154		5,823,972
Operating Lease, Weighted Average Remaining Lease Term (Year)	8 years 73 days		8 years 73 days
Operating Lease, Weighted Average Discount Rate, Percent	4.13%		4.13%
Operating Lease, Expense	$ 223,993	$ 219,781	$ 448,025	$ 439,093
Short-term Lease, Cost			$ 0
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total					7,814,701
Operating Lease, Right-of-Use Asset					$ 5,823,972

X

- Definition

The amount of increase in lease liability with every 10% increase in index.

+ References

No definition available.

+ Details

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X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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