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Note 7 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2025 |  |  | 2024 |
Expected life of stock options (in years) |  |  | 4.7 |  |  |  | 6.2 |
Risk free interest rate |  |  | 4.50 | % |  |  | 3.98 | %
Annualized Volatility |  |  | 34.8 | % |  |  | 32.3 | %
Dividend yields |  |  | 2.70 | % |  |  | 3.17 | %
Weighted-average fair value of options granted during the nine months ended September 30, 2025 and 2024 |  | $ | 17.90 |  |  | $ | 9.25 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term in Years |  |  | Intrinsic Value |
Options outstanding at January 1, 2024 |  |  | 165,517 |  |  | $ | 21.52 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (32,070 | ) |  |  | 17.03 |  |  |  |  |  |  |  |  |
Options cancelled |  |  | (1,600 | ) |  |  | 24.40 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2024 |  |  | 131,847 |  |  | $ | 22.58 |  |  |  |  |  |  |  |  |
Options cancelled |  |  | (800 | ) |  | $ | 24.40 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (40,255 | ) |  |  | 22.56 |  |  |  |  |  |  |  |  |
Options outstanding at September 30, 2025 |  |  | 90,792 |  |  | $ | 22.57 |  |  |  | 1.4 |  |  | $ | 1,867,655 |
Options exercisable at September 30, 2025 |  |  | 90,792 |  |  | $ | 22.57 |  |  |  | 1.4 |  |  | $ | 1,867,655 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term in Years |  |  | Intrinsic Value |
Options outstanding at January 1, 2024 |  |  | 105,500 |  |  | $ | 31.00 |  |  |  |  |  |  |  |  |
Options granted |  |  | 107,200 |  |  |  | 34.07 |  |  |  |  |  |  |  |  |
Options cancelled |  |  | (1,200 | ) |  |  | 34.07 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (1,300 | ) |  |  | 31.00 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2024 |  |  | 210,200 |  |  | $ | 32.55 |  |  |  |  |  |  |  |  |
Options granted |  |  | 30,803 |  |  |  | 31.09 |  |  |  |  |  |  |  |  |
Options cancelled |  |  | (2,760 | ) |  |  | 34.07 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (3,600 | ) |  |  | 31.51 |  |  |  |  |  |  |  |  |
Options outstanding at September 30, 2025 |  |  | 234,643 |  |  | $ | 32.35 |  |  |  | 7.4 |  |  | $ | 2,530,689 |
Options exercisable at September 30, 2025 |  |  | 113,443 |  |  | $ | 31.57 |  |  |  | 7.0 |  |  | $ | 1,312,289 |
Options expected to vest after September 30, 2025 |  |  | 107,662 |  |  | $ | 33.09 |  |  |  | 7.8 |  |  | $ | 1,082,305 |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | 2025 |  |  | 2024 |
Fair value of options vested |  | $ | 191,000 |  |  | $ | 192,000 |
Intrinsic value of options exercised |  | $ | 260,000 |  |  | $ | 25,000 |
Cash received from option exercises |  | $ | 353,000 |  |  | $ | - |
Tax benefit from option exercises |  | $ | 24,000 |  |  | $ | 5,000 |
Compensation cost |  | $ | 93,000 |  |  | $ | 131,000 |
Tax benefit associated with compensation cost |  | $ | 5,000 |  |  | $ | 13,000 |
|  | 2025 |  |  | 2024 |
Fair value of options vested |  | $ | 384,000 |  |  | $ | 199,000 |
Intrinsic value of options exercised |  | $ | 874,000 |  |  | $ | 561,000 |
Cash received from option exercises |  | $ | 936,000 |  |  | $ | 367,000 |
Tax benefit from option exercises |  | $ | 43,000 |  |  | $ | 74,000 |
Compensation cost |  | $ | 256,000 |  |  | $ | 350,000 |
Tax benefit associated with compensation cost |  | $ | 14,000 |  |  | $ | 33,000 |

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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