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Note L - Stock Options (Tables) | 12 Months Ended
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Sep. 30, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Incentive Stock Options |  |  | Nonqualified Stock Options |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  | Stock |  |  | Average |  |  | Stock |  |  | Average |
|  | Options |  |  | Exercise |  |  | Options |  |  | Exercise |
|  | Outstanding |  |  | Price |  |  | Outstanding |  |  | Price |
Balance, September 28, 2014 |  |  | 295,645 |  |  | $ | 60.83 |  |  |  | 249,379 |  |  | $ | 53.38 |
Granted |  |  | 114,488 |  |  |  | 100.94 |  |  |  | 55,152 |  |  |  | 106.96 |
Exercised |  |  | (70,792 | ) |  |  | 47.30 |  |  |  | (6,590 | ) |  |  | 51.14 |
Canceled |  |  | (6,989 | ) |  |  | 84.13 |  |  |  | - |  |  |  | - |
Balance, September 26, 2015 |  |  | 332,352 |  |  |  | 77.04 |  |  |  | 297,941 |  |  |  | 63.34 |
Granted |  |  | 120,450 |  |  |  | 108.69 |  |  |  | 58,720 |  |  |  | 112.35 |
Exercised |  |  | (86,223 | ) |  |  | 53.67 |  |  |  | (44,777 | ) |  |  | 42.53 |
Canceled |  |  | (10,792 | ) |  |  | 97.07 |  |  |  | - |  |  |  | - |
Balance, September 24, 2016 |  |  | 355,787 |  |  |  | 92.81 |  |  |  | 311,884 |  |  |  | 75.56 |
Granted |  |  | 121,508 |  |  |  | 129.35 |  |  |  | 59,786 |  |  |  | 129.94 |
Exercised |  |  | (78,114 | ) |  |  | 65.49 |  |  |  | (60,156 | ) |  |  | 41.46 |
Canceled |  |  | (6,200 | ) |  |  | 100.93 |  |  |  | - |  |  |  | - |
Balance, September 30, 2017 |  |  | 392,981 |  |  | $ | 109.41 |  |  |  | 311,514 |  |  | $ | 92.58 |
Exercisable Options September 30, 2017 |  |  | 51,719 |  |  | $ | 81.54 |  |  |  | 137,856 |  |  | $ | 62.21 |
Non-qualified Stock Options [Member] |
Notes Tables |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options Outstanding |  |  | Options Exercisable |
|  |  |  | Number |  |  | Weighted- |  |  |  |  |  |  | Number |  |  |  |  |
|  |  |  | Outstanding |  |  | Average |  |  | Weighted- |  |  | Exercisable |  |  | Weighted- |
|  |  |  | at |  |  | Remaining |  |  | Average |  |  | at |  |  | Average |
Range of |  | September 30, |  |  | Contractual |  |  | Exercise |  |  | September 30, |  |  | Exercise |
Exercise Prices |  | 2017 |  |  | Life |  |  | Price |  |  | 2017 |  |  | Price |
$34.17 | - | $47.59 |  |  | 60,000 |  |  |  | 2.7 |  |  | $ | 41.17 |  |  |  | 60,000 |  |  | $ | 41.17 |
$57.33 | - | $81.67 |  |  | 57,856 |  |  |  | 4.1 |  |  |  | 72.95 |  |  |  | 57,856 |  |  |  | 72.95 |
$94.24 | - | $131.30 |  |  | 193,658 |  |  |  | 5.5 |  |  |  | 114.38 |  |  |  | 20,000 |  |  |  | 94.24 |
Total options |  |  | 311,514 |  |  |  | 4.7 |  |  |  | 92.58 |  |  |  | 137,856 |  |  |  | 62.21 |
Incentive Stock Options [Member] |
Notes Tables |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options Outstanding |  |  | Options Exercisable |
|  |  |  | Number |  |  | Weighted- |  |  |  |  |  |  | Number |  |  |  |  |
|  |  |  | Outstanding |  |  | Average |  |  | Weighted- |  |  | Exercisable |  |  | Weighted- |
|  |  |  | at |  |  | Remaining |  |  | Average |  |  | at |  |  | Average |
Range of |  | September 30, |  |  | Contractual |  |  | Exercise |  |  | September 30, |  |  | Exercise |
Exercise Prices |  | 2017 |  |  | Life |  |  | Price |  |  | 2017 |  |  | Price |
$57.15 | - | $81.67 |  |  | 51,219 |  |  |  | 1.1 |  |  | $ | 81.43 |  |  |  | 51,219 |  |  | $ | 81.43 |
$93.17 | - | $137.16 |  |  | 341,762 |  |  |  | 3.4 |  |  |  | 113.60 |  |  |  | 500 |  |  |  | 93.17 |
Total options |  |  | 392,981 |  |  |  | 3.1 |  |  |  | 109.41 |  |  |  | 51,719 |  |  |  | 81.54 |

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