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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2013
Schedule of Product Warranty Liability [Table Text Block] |
|  | Year Ended March 31, |
|  | 2013 |  |  | 2012 |
Beginning Balance |  | $ | 253,000 |  |  | $ | 162,000 |
Amounts charged to expense |  |  | 184,000 |  |  |  | 489,000 |
Actual warranty costs paid |  |  | (228,000 | ) |  |  | (398,000 | )
Ending Balance |  | $ | 209,000 |  |  | $ | 253,000 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration