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Note 9 - Derivative Financial Instruments - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Fair Value, Asset	$ 1,107
Fair Value, Liability		$ (181)
Interest Rate Swap Effective December 19, 2014 Number One [Member]
Notional Amount	$ 20,000
Fixed Rate	1.18%
Maturity	Dec. 19, 2017
Fair Value, Asset		8
Interest Rate Swap Effective December 19, 2014 Number Two [Member]
Notional Amount	$ 5,000
Fixed Rate	1.20%
Maturity	Dec. 19, 2017
Fair Value, Asset		1
Interest Rate Swap Effective December 18, 2015 [Member]
Notional Amount	$ 15,000
Fixed Rate	1.46%
Maturity	Dec. 19, 2018
Fair Value, Asset	$ 66
Fair Value, Liability		(1)
Interest Rate Swap Effective December 19, 2015 [Member]
Notional Amount	$ 10,000
Fixed Rate	2.01%
Maturity	Dec. 19, 2019
Fair Value, Asset	$ 49
Fair Value, Liability		(106)
Interest Rate Swap Effective May 24, 2017 Number One [Member]
Notional Amount	$ 25,000
Fixed Rate	1.88%
Maturity	Apr. 24, 2022
Fair Value, Asset	$ 618
Fair Value, Liability		(60)
Interest Rate Swap Effective May 24, 2017 Number Two [Member]
Notional Amount	$ 25,000
Fixed Rate	1.67%
Maturity	May 24, 2020
Fair Value, Asset	$ 374
Fair Value, Liability		$ (23)

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Details

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- Details

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