Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Estimated Fair Value of Stock Options Assumptions (Details)

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Note 6 - Stock-based Compensation - Estimated Fair Value of Stock Options Assumptions (Details) - $ / shares
6 Months Ended 12 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Apr. 02, 2017
Number of options issued (in shares) 130,000 120,000 120,000
Grant date     Jun. 08, 2016
Dividend yield     3.33%
Expected volatility     20.00%
Risk free interest rate     0.93%
Contractual term (years) (Year)     10 years
Expected term (years) (Year)     3 years
Forfeiture rate     5.00%
Exercise price (grant-date closing price) per option (in dollars per share)     $ 9.60
Fair value per option (in dollars per share)     $ 0.94
August 4 2017 [Member]      
Number of options issued (in shares) 20,000    
Grant date Aug. 04, 2017    
Dividend yield 5.77%    
Expected volatility 25.00%    
Risk free interest rate 1.51%    
Contractual term (years) (Year) 10 years    
Expected term (years) (Year) 3 years    
Forfeiture rate 5.00%    
Exercise price (grant-date closing price) per option (in dollars per share) $ 5.55    
Fair value per option (in dollars per share) $ 0.50    
June 8 2017 [Member]      
Number of options issued (in shares) 110,000    
Grant date Jun. 08, 2017    
Dividend yield 4.13%    
Expected volatility 25.00%    
Risk free interest rate 1.47%    
Contractual term (years) (Year) 10 years    
Expected term (years) (Year) 3 years    
Forfeiture rate 5.00%    
Exercise price (grant-date closing price) per option (in dollars per share) $ 7.75    
Fair value per option (in dollars per share) $ 0.85