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Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Intangible assets |  |  |
Amortization expense | $ 361,000 | $ 391,000 | $ 425,000
Changes in intangible assets |  |  |
Carrying value | 13,848,000 | 13,848,000 | 13,848,000
Accumulated amortization | (9,909,000) | (9,548,000) | (9,157,000)
Net book value | 3,939,000 | $ 4,300,000 | 4,691,000
Future amortization expense |  |  |
2024 | 336,000 |  |
2025 | 315,000 |  |
2026 | 297,000 |  |
2027 | 283,000 |  |
2027 | $ 269,000 |  |
Weighted average remaining period | 15 years 6 months | 16 years 2 months 12 days |
Customer relationships |  |  |
Changes in intangible assets |  |  |
Carrying value | $ 9,800,000 | $ 9,800,000 | 9,800,000
Accumulated amortization | (9,302,000) | (9,143,000) | (8,955,000)
Net book value | 498,000 | 657,000 | 845,000
Trade name |  |  |
Changes in intangible assets |  |  |
Carrying value | 4,048,000 | 4,048,000 | 4,048,000
Accumulated amortization | (607,000) | (405,000) | (202,000)
Net book value | $ 3,441,000 | $ 3,643,000 | $ 3,846,000

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 + Details
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