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Note 17 - Employee Benefit Plans - Company's Participation in Multiemployer Pension Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Multiemployer Plan, Period Contributions | $ 1,105 | $ 1,120 | $ 1,163
New England Teamsters and Trucking Industry Pension Fund [Member] |  |  |
Multiemployer Plan, Period Contributions | 461 | 482 | 530
IAM National Pension Fund National Pension Plan [Member] |  |  |
Multiemployer Plan, Period Contributions | $ 644 | $ 638 | $ 633

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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |