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Note 5 - Goodwill, Intangible Assets and Long Term Assets (Detail) - Goodwill activity by segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended					9 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 31, 2012	Mar. 31, 2013 Battery & Energy Products [Member]	Apr. 01, 2012 Battery & Energy Products [Member]	Dec. 31, 2012 Battery & Energy Products [Member]	Mar. 31, 2013 Communications Systems [Member]	Dec. 31, 2012 Communications Systems [Member]	Apr. 01, 2012 Communications Systems [Member]	Dec. 31, 2011 Communications Systems [Member]	Dec. 31, 2012 Discontinued Operations [Member]	Dec. 31, 2011 Discontinued Operations [Member]
Balance at	$ 16,344	$ 18,356	$ 18,378	$ 4,851	$ 4,838	$ 4,860	$ 11,493	$ 11,493	$ 11,493	$ 11,493	$ 2,025	$ 2,025
Sale of RedBlack Communications			(2,025)								(2,025)
Effect of foreign currency translations	13	22	(9)	13	22	(9)
Balance at	$ 16,357	$ 18,378	$ 16,344	$ 4,864	$ 4,860	$ 4,851	$ 11,493	$ 11,493	$ 11,493	$ 11,493		$ 2,025

X

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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