Note 2 - Revenue Recognition - Percentage-of-Completion - ITATS ("Intermediate Level TACAN Test Set") (AN/ARM-206) (Detail) (USD $)	9 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Billing in Excess of Cost of Earnings	$ 0	$ (424,202)
Number of units for production delivery order	102
Value of Production Delivery Order	5,300,000
ITATS Program [Member]
Increase (Decrease) in Billing in Excess of Cost of Earnings	$ 0

The increase (decrease) during the reporting period in the liability reflecting cash payments received before the related costs have been incurred.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration