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Consolidated Statements of Operations and Retained Earnings (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
OPERATIONS:
Net sales	$ 38,109us-gaap_SalesRevenueGoodsNet	$ 30,169us-gaap_SalesRevenueGoodsNet	$ 137,380us-gaap_SalesRevenueGoodsNet	$ 107,040us-gaap_SalesRevenueGoodsNet
Cost of sales	35,771us-gaap_CostOfGoodsAndServicesSold	29,390us-gaap_CostOfGoodsAndServicesSold	125,843us-gaap_CostOfGoodsAndServicesSold	98,851us-gaap_CostOfGoodsAndServicesSold
Gross profit	2,338us-gaap_GrossProfit	779us-gaap_GrossProfit	11,537us-gaap_GrossProfit	8,189us-gaap_GrossProfit
Selling and administrative expenses	5,159us-gaap_SellingGeneralAndAdministrativeExpense	5,010us-gaap_SellingGeneralAndAdministrativeExpense	15,347us-gaap_SellingGeneralAndAdministrativeExpense	14,361us-gaap_SellingGeneralAndAdministrativeExpense
Gain on sale of idle property,plant and equipment		300us-gaap_GainLossOnSaleOfPropertyPlantEquipment		462us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Operating loss	(2,821)us-gaap_OperatingIncomeLoss	(3,931)us-gaap_OperatingIncomeLoss	(3,810)us-gaap_OperatingIncomeLoss	(5,710)us-gaap_OperatingIncomeLoss
Interest expense	(92)us-gaap_InterestExpense		(279)us-gaap_InterestExpense
Interest income	2us-gaap_InvestmentIncomeInterest	25us-gaap_InvestmentIncomeInterest	50us-gaap_InvestmentIncomeInterest	75us-gaap_InvestmentIncomeInterest
Loss from continuing operations before income taxes	(2,911)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(3,906)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(4,039)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(5,635)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from income taxes	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit
Loss from continuing operations	(2,911)us-gaap_IncomeLossFromContinuingOperations	(3,906)us-gaap_IncomeLossFromContinuingOperations	(4,039)us-gaap_IncomeLossFromContinuingOperations	(5,635)us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations, net of income taxes	(86)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(1,806)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(6,175)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(3,669)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net loss	(2,997)us-gaap_NetIncomeLoss	(5,712)us-gaap_NetIncomeLoss	(10,214)us-gaap_NetIncomeLoss	(9,304)us-gaap_NetIncomeLoss
Basic loss per share	$ (0.36)us-gaap_EarningsPerShareBasic	$ (0.68)us-gaap_EarningsPerShareBasic	$ (1.22)us-gaap_EarningsPerShareBasic	$ (1.11)us-gaap_EarningsPerShareBasic
Loss per share from continuing operations	$ (0.35)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.47)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.48)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.67)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Loss per share from discontinued operations	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.21)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.74)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.44)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Weighted average number of common shares outstanding	8,391,244us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,391,244us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,391,244us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,391,244us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
RETAINED EARNINGS:
Balance at beginning of period	87,074us-gaap_RetainedEarningsAccumulatedDeficit	102,563us-gaap_RetainedEarningsAccumulatedDeficit	94,291us-gaap_RetainedEarningsAccumulatedDeficit	106,155us-gaap_RetainedEarningsAccumulatedDeficit
Net loss	(2,997)us-gaap_NetIncomeLoss	(5,712)us-gaap_NetIncomeLoss	(10,214)us-gaap_NetIncomeLoss	(9,304)us-gaap_NetIncomeLoss
Balance at end of period	$ 84,077us-gaap_RetainedEarningsAccumulatedDeficit	$ 96,851us-gaap_RetainedEarningsAccumulatedDeficit	$ 84,077us-gaap_RetainedEarningsAccumulatedDeficit	$ 96,851us-gaap_RetainedEarningsAccumulatedDeficit

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 4

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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