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Note 9. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Schedule of Trading Securities and Other Trading Assets
SERP investments	$ 8,543	$ 8,769
SERP obligation	8,543	8,769
Prepaid Expenses and Other Current Assets
Schedule of Trading Securities and Other Trading Assets
SERP investments	303	294
Other Noncurrent Assets
Schedule of Trading Securities and Other Trading Assets
SERP investments	8,240	8,475
Other Current Liabilities
Schedule of Trading Securities and Other Trading Assets
SERP obligation	303	294
Other Noncurrent Liabilities
Schedule of Trading Securities and Other Trading Assets
SERP obligation	$ 8,240	$ 8,475

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- Definition

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
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