Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net income	$ 3,508,000us-gaap_NetIncomeLoss	$ 1,726,000us-gaap_NetIncomeLoss
Non-cash items included in net income
Depreciation and amortization	4,728,000	4,583,000
Deferred income taxes	(584,000)us-gaap_DeferredIncomeTaxExpenseBenefit	284,000us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred compensation plan	62,000	57,000
Stock option expense	1,153,000us-gaap_StockOptionPlanExpense	896,000us-gaap_StockOptionPlanExpense
Issuance of common shares as compensation	144,000us-gaap_ShareBasedCompensation	144,000us-gaap_ShareBasedCompensation
(Gain) on disposition of fixed assets	(2,000)us-gaap_GainLossOnDispositionOfAssets	(18,000)us-gaap_GainLossOnDispositionOfAssets
Loss on sale of subsidiary	565,000us-gaap_GainLossOnSaleOfBusiness
Allowance for doubtful accounts	268,000us-gaap_ProvisionForDoubtfulAccounts	88,000us-gaap_ProvisionForDoubtfulAccounts
Inventory obsolescence reserve	1,093,000us-gaap_InventoryWriteDown	973,000us-gaap_InventoryWriteDown
Changes in certain assets and liabilities:
Accounts receivable	6,579,000	8,442,000
Inventories	901,000us-gaap_IncreaseDecreaseInInventories	(5,459,000)us-gaap_IncreaseDecreaseInInventories
Refundable income taxes	1,885,000	365,000
Accounts payable	(1,884,000)	(534,000)
Accrued expenses and other	4,340,000	(1,782,000)
Customer prepayments	(625,000)	1,064,000
Net cash flows provided by operating activities	21,788,000	10,829,000
Cash Flows from Investing Activities
Purchases of property, plant and equipment	(3,439,000)	(4,528,000)
Proceeds from sale of subsidiary, net of cash sold	1,494,000
Proceeds from sale of fixed assets	953,000	250,000
Net cash flows (used in) investing activities	(992,000)	(4,278,000)
Cash Flows from Financing Activities
Cash dividends paid	(2,172,000)us-gaap_PaymentsOfDividendsCommonStock	(4,333,000)us-gaap_PaymentsOfDividendsCommonStock
Proceeds and tax benefits from exercises of stock options	401,000	351,000
Purchase of treasury shares	(165,000)	(166,000)
Issuance of treasury shares	93,000us-gaap_ProceedsFromSaleOfTreasuryStock	64,000us-gaap_ProceedsFromSaleOfTreasuryStock
Net cash flows (used in) financing activities	(1,843,000)	(4,084,000)
Increase in cash and cash equivalents	18,953,000	2,467,000
Cash and cash equivalents at beginning of period	9,013,000	7,949,000
Cash and cash equivalents at end of period	27,966,000	10,416,000
Building [Member]
Non-cash items included in net income
(Gain) on disposition of building	$ (343,000)

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