Short-Term Borrowings and Long-Term Debt (Schedule of Debt) (Details) - USD ($)	Dec. 31, 2020	Jun. 30, 2020	Apr. 30, 2019
Debt Instrument [Line Items]
Short-term borrowings	$ 0	$ 3,524,000
Current portion of long-term debt	7,843,000	7,839,000
Long-term debt	139,081,000	143,175,000
Borrowings under revolving credit facility	5,000,000	67,714,000
Total debt	151,924,000	246,956,000
Discontinued Operations, Held-for-sale
Debt Instrument [Line Items]
Borrowings under revolving credit facility	0	24,704,000
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	135,000,000	138,750,000	$ 150,000,000
Multi-Currency Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings under revolving credit facility	5,000,000	92,418,000
Mississippi Revenue Bond
Debt Instrument [Line Items]
Long-term debt	$ 4,081,000	$ 4,425,000

Disposal Group, Including Discontinued Operation, Long-term Debt, Excluding Current Maturities

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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.

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No definition available.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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