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Note 10 - Derivative Financial Instruments - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Jun. 30, 2019 | Jun. 30, 2018
Fair Value, Asset |  | $ 1,325
Fair Value, Liability | $ (1,380) |
Interest Rate Swap Effective December 18, 2015 [Member] |  |
Notional Amount | $ 15,000 |
Fixed Rate | 1.46% |
Maturity | Dec. 19, 2018 |
Fair Value, Asset |  | 55
Interest Rate Swap Effective December 19, 2015 [Member] |  |
Notional Amount | $ 10,000 |
Fixed Rate | 2.01% |
Maturity | Dec. 19, 2019 |
Fair Value, Asset | $ 3 | 74
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 |  | 764
Fair Value, Liability | $ (190) |
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 | $ 49 | $ 432
Interest Rate Swap Effective August 6, 2018 [Member] |  |
Notional Amount | $ 25,000 |
Fixed Rate | 2.83% |
Maturity | Aug. 06, 2023 |
Fair Value, Liability | $ (1,242) |

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- 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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- Definition Fair value of liability associated with financial asset or other 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 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 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 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- 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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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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