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Note 5 - Accrued Expenses (Tables) | 12 Months Ended
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Mar. 31, 2013
Schedule of Accrued Liabilities [Table Text Block] |
|  | March 31, |
|  | 2013 |  |  | 2012 |
Salaries, wages and related items |  | $ | 1,272,183 |  |  | $ | 1,188,016 |
Profit sharing |  |  | 384,999 |  |  |  | 262,599 |
Health insurance |  |  | 149,403 |  |  |  | 191,397 |
Warranty reserves |  |  | 208,745 |  |  |  | 253,225 |
Other |  |  | 104,670 |  |  |  | 71,602 |
Total |  | $ | 2,120,000 |  |  | $ | 1,966,839 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration