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Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Mar. 31, 2015
Jun. 30, 2014
Current assets:    
Cash $ 13,646,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 16,233,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 7,410,000us-gaap_ShortTermInvestments 8,723,000us-gaap_ShortTermInvestments
Accounts receivable (less allowance for doubtful accounts of $603 and $704, respectively) 31,016,000us-gaap_AccountsReceivableNetCurrent 43,712,000us-gaap_AccountsReceivableNetCurrent
Inventories 66,219,000us-gaap_InventoryNet 65,582,000us-gaap_InventoryNet
Current deferred income tax assets 5,411,000us-gaap_DeferredTaxAssetsNetCurrent 6,037,000us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 7,587,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 6,615,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 131,289,000us-gaap_AssetsCurrent 146,902,000us-gaap_AssetsCurrent
Property, plant and equipment, net 44,669,000us-gaap_PropertyPlantAndEquipmentNet 51,537,000us-gaap_PropertyPlantAndEquipmentNet
Long-term income taxes receivable 3,775,000us-gaap_IncomeTaxesReceivableNoncurrent 3,775,000us-gaap_IncomeTaxesReceivableNoncurrent
Long-term deferred income tax assets, net of current portion 15,407,000us-gaap_DeferredTaxAssetsNetNoncurrent 16,537,000us-gaap_DeferredTaxAssetsNetNoncurrent
Intangible assets, net 7,249,000us-gaap_FiniteLivedIntangibleAssetsNet 7,760,000us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill 3,034,000us-gaap_Goodwill 3,034,000us-gaap_Goodwill
Other assets 2,069,000us-gaap_OtherAssetsNoncurrent 1,898,000us-gaap_OtherAssetsNoncurrent
Total assets 207,492,000us-gaap_Assets 231,443,000us-gaap_Assets
Current liabilities:    
Notes payable and current maturities of long-term debt 1,570,000us-gaap_ShortTermBorrowings 10,548,000us-gaap_ShortTermBorrowings
Accounts payable 10,183,000us-gaap_AccountsPayableCurrent 9,980,000us-gaap_AccountsPayableCurrent
Accrued expenses 6,225,000us-gaap_AccruedLiabilitiesCurrent 8,516,000us-gaap_AccruedLiabilitiesCurrent
Accrued compensation 5,093,000us-gaap_AccruedSalariesCurrent 6,642,000us-gaap_AccruedSalariesCurrent
Total current liabilities 23,071,000us-gaap_LiabilitiesCurrent 35,686,000us-gaap_LiabilitiesCurrent
Long-term debt, net of current portion 19,543,000us-gaap_LongTermDebt 10,804,000us-gaap_LongTermDebt
Other income tax obligations 5,444,000us-gaap_AccruedIncomeTaxesNoncurrent 3,013,000us-gaap_AccruedIncomeTaxesNoncurrent
Deferred income tax liabilities 1,822,000us-gaap_DeferredTaxLiabilitiesNoncurrent 2,037,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Postretirement benefit and pension obligations 37,780,000us-gaap_PostemploymentBenefitsLiabilityNoncurrent 43,589,000us-gaap_PostemploymentBenefitsLiabilityNoncurrent
Total liabilities 87,660,000us-gaap_Liabilities 95,129,000us-gaap_Liabilities
Stockholders' equity:    
Additional paid-in capital 54,581,000us-gaap_AdditionalPaidInCapital 54,063,000us-gaap_AdditionalPaidInCapital
Retained earnings 99,427,000us-gaap_RetainedEarningsAccumulatedDeficit 95,715,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (41,167,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (20,425,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 119,832,000us-gaap_StockholdersEquity 136,314,000us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity 207,492,000us-gaap_LiabilitiesAndStockholdersEquity 231,443,000us-gaap_LiabilitiesAndStockholdersEquity
Common Class A [Member]    
Stockholders' equity:    
Class A Common stock $1 par (20,000,000 shares authorized; 6,215,042 outstanding at March 31, 2015 and 6,165,838 outstanding at June 30, 2014) 6,215,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 6,166,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Class B [Member]    
Stockholders' equity:    
Class A Common stock $1 par (20,000,000 shares authorized; 6,215,042 outstanding at March 31, 2015 and 6,165,838 outstanding at June 30, 2014) $ 776,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 795,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember