| Note 6 - Stock-based Compensation (Detail) - Estimated fair value of stock options granted (USD $) | 6 Months Ended | |
|---|---|---|
| Sep. 30, 2012 | Oct. 02, 2011 | |
| Options issued (in Shares) | 110,000 | 100,000 | 
| Grant Date | Jun. 13, 2012 | Jun. 10, 2011 | 
| Dividend yield | 5.90% | 2.49% | 
| Expected volatility | 65.00% | 60.00% | 
| Risk free interest rate | 0.55% | 1.84% | 
| Contractual term (years) | 10 years | 10 years | 
| Expected term (years) | 4 years | 5 years 9 months | 
| Forfeiture rate | 5.00% | 5.00% | 
| Exercise price (grant-date closing price) (in Dollars per share) | $ 5.42 | $ 4.81 | 
| Fair value (in Dollars per share) | $ 1.84 | $ 2.16 | 
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- Definition Contractual term. No definition available. 
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- Definition Forfeiture rate of share-based compensation stock options. No definition available. 
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- Definition Date in which share-based compensation stock options is granted. No definition available. 
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. No definition available. 
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Gross number of share options (or share units) granted during the period. No definition available. 
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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