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Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Dec. 31, 2014
Jun. 30, 2014
Current assets:    
Cash $ 16,139,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 16,233,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 7,790,000us-gaap_ShortTermInvestments 8,723,000us-gaap_ShortTermInvestments
Accounts receivable (less allowance for doubtful accounts of $766 and $704, respectively) 33,531,000us-gaap_AccountsReceivableNetCurrent 43,712,000us-gaap_AccountsReceivableNetCurrent
Inventories 66,418,000us-gaap_InventoryNet 65,582,000us-gaap_InventoryNet
Current deferred income tax assets 4,651,000us-gaap_DeferredTaxAssetsNetCurrent 6,037,000us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 8,241,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 6,615,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 136,770,000us-gaap_AssetsCurrent 146,902,000us-gaap_AssetsCurrent
Property, plant and equipment, net 47,097,000us-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 16,199,000us-gaap_DeferredTaxAssetsNetNoncurrent 16,537,000us-gaap_DeferredTaxAssetsNetNoncurrent
Intangible assets, net 7,426,000us-gaap_FiniteLivedIntangibleAssetsNet 7,760,000us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill 3,034,000us-gaap_Goodwill 3,034,000us-gaap_Goodwill
Other assets 2,015,000us-gaap_OtherAssetsNoncurrent 1,898,000us-gaap_OtherAssetsNoncurrent
Total assets 216,316,000us-gaap_Assets 231,443,000us-gaap_Assets
Current liabilities:    
Notes payable and current maturities of long-term debt 11,501,000us-gaap_ShortTermBorrowings 10,548,000us-gaap_ShortTermBorrowings
Accounts payable 9,210,000us-gaap_AccountsPayableCurrent 9,980,000us-gaap_AccountsPayableCurrent
Accrued expenses 6,718,000us-gaap_AccruedLiabilitiesCurrent 8,516,000us-gaap_AccruedLiabilitiesCurrent
Accrued compensation 3,824,000us-gaap_AccruedSalariesCurrent 6,642,000us-gaap_AccruedSalariesCurrent
Total current liabilities 31,253,000us-gaap_LiabilitiesCurrent 35,686,000us-gaap_LiabilitiesCurrent
Long-term debt, net of current portion 10,005,000us-gaap_LongTermDebt 10,804,000us-gaap_LongTermDebt
Other income tax obligations 4,485,000us-gaap_AccruedIncomeTaxesNoncurrent 3,013,000us-gaap_AccruedIncomeTaxesNoncurrent
Deferred income tax liabilities 2,017,000us-gaap_DeferredTaxLiabilitiesNoncurrent 2,037,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Postretirement benefit and pension obligations 41,624,000us-gaap_PostemploymentBenefitsLiabilityNoncurrent 43,589,000us-gaap_PostemploymentBenefitsLiabilityNoncurrent
Total liabilities 89,384,000us-gaap_Liabilities 95,129,000us-gaap_Liabilities
Stockholders' equity:    
Additional paid-in capital 54,468,000us-gaap_AdditionalPaidInCapital 54,063,000us-gaap_AdditionalPaidInCapital
Retained earnings 97,689,000us-gaap_RetainedEarningsAccumulatedDeficit 95,715,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (32,215,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (20,425,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 126,932,000us-gaap_StockholdersEquity 136,314,000us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity 216,316,000us-gaap_LiabilitiesAndStockholdersEquity 231,443,000us-gaap_LiabilitiesAndStockholdersEquity
Common Class A [Member]    
Stockholders' equity:    
Common stock 6,199,000us-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:    
Common stock $ 791,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 795,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember