| 
           Note 5 - Stock-based Compensation (Details) - Estimated Fair Value Of Stock Options Assumptions (USD $) 
         | 
        3 Months Ended | |||
|---|---|---|---|---|
| 
           Jun. 29, 2014 
         | 
        
           Jun. 29, 2014 
         | 
        
           Jun. 30, 2013 
         | 
        
           Jun. 30, 2013 
         | 
      |
| Estimated Fair Value Of Stock Options Assumptions [Abstract] | ||||
| Options issued (in Shares) | 165,000 | 165,000 | 100,000 | 100,000 | 
| Grant Date | Jun. 18, 2014 | Jun. 14, 2013 | ||
| Dividend yield | 4.05% | 5.21% | ||
| Expected volatility | 30.00% | 35.00% | ||
| Risk free interest rate | 0.95% | 0.49% | ||
| Contractual term (years) | 10 years | 10 years | ||
| Expected term (years) | 3 years | 3 years | ||
| Forfeiture rate | 5.00% | 5.00% | ||
| Exercise price (grant-date closing price) (in Dollars per share) | $ 7.90 | $ 7.90 | $ 6.14 | $ 6.14 | 
| Fair value (in Dollars per share) | $ 1.19 | $ 0.98 | ||
| X | ||||||||||
| 
             
- Definition 
          Contractual term. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Forfeiture rate of share-based compensation stock options. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Date in which share-based compensation stock options is granted. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- 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 
  | 
        
| X | ||||||||||
| 
             
- 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 
  | 
        
| X | ||||||||||
| 
             
- 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 
  | 
        
| X | ||||||||||
| 
             
- 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 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Gross number of share options (or share units) granted during the period. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- 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 
  |