Note 7 - Lease Commitments - Capital and Financing Lease Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Total capital and financing lease obligations	$ 45,623	$ 41,142
Less current portion	(843)	(736)
Total capital and financing lease obligations, net of current portion	44,780	40,406
Due in Monthly Installments Through Fiscal Year 2033 [Member]
Capital lease finance obligations	34,992	32,523
Asset not under Construction, Due in Monthly Installments Through Fiscal Year 2041 [Member]
Capital lease finance obligations	6,126	4,763
Asset under Construction Due in Monthly Installments Through Fiscal Year 2033 [Member]
Capital lease finance obligations	4,505	2,350
Asset under Construction Due in Monthly Installments Through Fiscal Year 2034 [Member]
Capital lease finance obligations		$ 1,506

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

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