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Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Stock Options, Activity |
| 2018 | 2017 | 2016
Options available for grant at end of year | 146,075 | 176,294 | 207,608
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | Following is a summary of activity in the Restricted Stock Awards for the periods indicated:
| 2018 |  |  | 2017 |  |  | 2016 |  |
| Shares |  | Grant-Date Fair Value* | Shares |  | Grant-Date Fair Value* | Shares |  | Grant-Date Fair Value*
Options outstanding at beginning of year | 63,052 |  | $ | 70.08 | 45,621 |  | $ | 54.58 | 32,616 |  | $ | 53.31
Granted | 35,300 |  | 92.50 | 33,620 |  | 84.34 | 27,440 |  | 55.17
Exercised | (22,266) |  | 66.91 | (16,189) |  | 56.03 | (11,909) |  | 52.67
Canceled | (450) |  | 83.99 | — |  | — | (2,526) |  | 53.57
Options outstanding at end of year | 75,636 |  | 81.39 | 63,052 |  | 70.08 | 45,621 |  | 54.58
*Weighted Averages
Qualified Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Stock Options, Activity | Following is a summary of activity in the Incentive Stock Option Plans for the periods indicated:
| 2018 |  |  |  | 2017 |  |  |  | 2016 |  |
| Shares |  | Exercise Price* |  | Shares |  | Exercise Price* |  | Shares |  | Exercise Price*
Options outstanding at beginning of year | 172,875 |  | $ | 43.91 |  | 220,820 |  | $ | 37.39 |  | 254,195 |  | $ | 34.64
Granted | 9,500 |  | 92.50 |  | 10,750 |  | 83.99 |  | 21,000 |  | 54.87
Exercised | (41,205) |  | 34.89 |  | (54,945) |  | 24.83 |  | (43,775) |  | 26.59
Canceled | (1,000) |  | 54.49 |  | (3,750) |  | 54.57 |  | (10,600) |  | 50.68
Options outstanding at end of year | 140,170 |  | 49.78 |  | 172,875 |  | 43.91 |  | 220,820 |  | 37.39
Options exercisable at end of year | 96,320 |  | $ | 41.56 |  | 111,875 |  | $ | 36.44 |  | 136,220 |  | $ | 29.66
Options available for grant at end of year | 336,450 |  |  |  | 344,950 |  |  |  | 353,450 |  |
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | Options outstanding and exercisable at December 31, 2018 were as follows:
Qualified Stock Options | Options Outstanding |  |  |  |  |  | Options Exercisable |  |
| Shares | Remaining Contractual Life (yrs)* |  |  | Exercise Price* |  | Shares |  | Exercise Price*
Range of Exercise Price |  |  |  |  |  |  |  |  |
$11.45 - $24.69 | 6,000 |  | 0.53 |  | $ | 13.66 |  | 6,000 |  | $ | 13.66
$26.45 - $42.70 | 54,520 |  | 3.58 |  | $ | 35.83 |  | 54,520 |  | $ | 35.83
$49.44 - $83.99 | 70,150 |  | 6.56 |  | $ | 57.92 |  | 35,800 |  | $ | 54.96
$92.50 - $92.50 | 9,500 |  | 9.36 |  | $ | 92.50 |  | — |  | $ | —
Total | 140,170 |  |  |  |  |  | 96,320 |  |
*Weighted Averages
Non Qualified Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Stock Options, Activity | Following is a summary of activity in the Non-Qualified Stock Option Plans for the periods indicated:
| 2018 |  |  |  | 2017 |  |  |  | 2016 |  |
| Shares |  | Exercise Price* |  | Shares |  | Exercise Price* |  | Shares |  | Exercise Price*
Options outstanding at beginning of year | 67,000 |  | $ | 42.43 |  | 112,400 |  | $ | 34.48 |  | 127,300 |  | $ | 32.05
Granted | — |  | — |  | — |  | — |  | — |  | —
Exercised | (26,800) |  | 41.61 |  | (45,400) |  | 22.73 |  | (14,900) |  | 13.73
Canceled | — |  | — |  | — |  | — |  | — |  | —
Options outstanding at end of year | 40,200 |  | 42.99 |  | 67,000 |  | 42.43 |  | 112,400 |  | 34.48
Options exercisable at end of year | 34,400 |  | $ | 41.21 |  | 50,400 |  | $ | 39.86 |  | 85,000 |  | $ | 29.61
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | Options outstanding and exercisable as of December 31, 2018 were as follows:
Non-Qualified Stock Options | Options Outstanding |  |  |  |  |  | Options Exercisable |  |
| Shares | Remaining Contractual Life (yrs)* |  |  | Exercise Price* |  | Shares |  | Exercise Price*
Range of Exercise Price |  |  |  |  |  |  |  |  |
$11.45 - $24.69 | 8,000 |  | 0.36 |  | $ | 11.45 |  | 8,000 |  | $ | 11.45
$26.45 - $42.70 | 3,200 |  | 2.36 |  | 26.45 |  | 3,200 |  | 26.45
$49.44 - $83.99 | 29,000 |  | 5.37 |  | $ | 53.51 |  | 23,200 |  | $ | 53.51
Total | 40,200 |  |  |  |  |  | 34,400 |  |
*Weighted Averages

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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