Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net income (loss)	$ 16,518us-gaap_NetIncomeLoss	$ 9,358us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	3,362us-gaap_Depreciation	3,088us-gaap_Depreciation
Deferred income taxes	119us-gaap_DeferredIncomeTaxExpenseBenefit	(57)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense	1,595us-gaap_ShareBasedCompensation	1,135us-gaap_ShareBasedCompensation
Excess tax benefit from stock-based payment arrangements	41	(425)
Provision for losses on accounts receivable	(7)us-gaap_ProvisionForDoubtfulAccounts	1us-gaap_ProvisionForDoubtfulAccounts
Gain on disposition of capital assets	(113)	(22)
Changes in operating assets and liabilities:
Trade receivables	(8,145)	(4,319)
Inventories	(10,172)us-gaap_IncreaseDecreaseInInventories	317us-gaap_IncreaseDecreaseInInventories
Other current assets	(1,125)	(558)
Other assets	(102)	109
Accounts payable - trade	4,830	(61)
Accrued liabilities	(1,094)	2,134
Other long-term liabilities	382	312
Supplemental retirement plans	(24)	573
Net cash provided by operating activities	6,065	11,585
INVESTING ACTIVITIES:
Purchases of investments	(1,855)us-gaap_PaymentsToAcquireInvestments	(4,285)us-gaap_PaymentsToAcquireInvestments
Proceeds from sales of investments	1,526	3,957
Proceeds from sale of capital assets	124	31
Capital expenditures	(33,752)	(3,830)
Net cash (used in) provided by investing activities	(33,957)	(4,127)
FINANCING ACTIVITIES:
Proceeds from long-term debt, net	14,745
Dividends paid	(3,778)us-gaap_PaymentsOfDividends	(3,226)us-gaap_PaymentsOfDividends
Proceeds from issuance of common stock	518	1,714
Excess tax benefit from stock-based payment arrangements	(41)	425
Net cash used in financing activities	11,444	(1,087)
Increase (decrease) in cash and cash equivalents	(16,448)	6,371
Cash and cash equivalents at beginning of year	22,176us-gaap_Cash	10,934us-gaap_Cash
Cash and cash equivalents at end of year	5,728us-gaap_Cash	17,305us-gaap_Cash
SUPPLEMENTAL INFORMATION CASH PAID DURING THE PERIOD FOR:
Interest	89us-gaap_InterestPaid
Income taxes paid (refunded)	9,810us-gaap_IncomeTaxesPaidNet	4,990us-gaap_IncomeTaxesPaidNet
Capital Expenditures Incurred but Not yet Paid	$ 1,852	$ 20

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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