| 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 | | | (28,855 | ) | | | 22.74 | | | | | | | | | |
| Options outstanding at June 30, 2025 | | | 102,192 | | | $ | 22.52 | | | | 1.7 | | | $ | 2,242,440 | |
| Options exercisable at June 30, 2025 | | | 102,192 | | | $ | 22.52 | | | | 1.7 | | | $ | 2,242,440 | |
| | | 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 | | | - | | | | | | | | | | | | | |
| Options cancelled | | | (1,800 | ) | | | 34.07 | | | | | | | | | |
| Options exercised | | | (360 | ) | | | 34.07 | | | | | | | | | |
| Options outstanding at June 30, 2025 | | | 208,040 | | | $ | 32.53 | | | | 7.7 | | | $ | 2,481,438 | |
| Options exercisable at June 30, 2025 | | | 64,080 | | | $ | 31.98 | | | | 7.3 | | | $ | 723,463 | |
| Options expected to vest after June 30, 2025 | | | 136,762 | | | $ | 32.78 | | | | 7.9 | | | $ | 1,597,697 | |
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| Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
| | | 2025 | | | 2024 | |
| Fair value of options vested | | $ | - | | | $ | - | |
| Intrinsic value of options exercised | | $ | 243,000 | | | $ | 4,000 | |
| Cash received from option exercises | | $ | 254,000 | | | $ | 8,000 | |
| Tax benefit from option exercises | | $ | 2,000 | | | $ | - | |
| Compensation cost | | $ | 96,000 | | | $ | 131,000 | |
| Tax benefit associated with compensation cost | | $ | 5,000 | | | $ | 13,000 | |
| | | 2025 | | | 2024 | |
| Fair value of options vested | | $ | 193,000 | | | $ | 7,000 | |
| Intrinsic value of options exercised | | $ | 614,000 | | | $ | 536,000 | |
| Cash received from option exercises | | $ | 583,000 | | | $ | 367,000 | |
| Tax benefit from option exercises | | $ | 19,000 | | | $ | 69,000 | |
| Compensation cost | | $ | 163,000 | | | $ | 219,000 | |
| Tax benefit associated with compensation cost | | $ | 9,000 | | | $ | 20,000 | |
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