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INCOME TAXES - Reconciliation between the federal statutory rate and effective tax rate (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
INCOME TAXES |  |  |
Federal statutory rate | $ 3,311 | $ 4,440 | $ 10,933
State income taxes, net of federal benefit | $ 241 | $ 314 | $ 694
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration] | FLORIDA, NORTH CAROLINA | FLORIDA, NORTH CAROLINA | FLORIDA, NORTH CAROLINA
Research and development credit | $ (177) | $ (110) | $ (652)
Investment tax credit |  | (1,003) |
Change in unrecognized tax benefits | (69) | 49 | 241
Non-deductible expenses: |  |  |
Long-term retirement plan | 988 |  |
Other | (184) | (162) | (137)
Cross-border tax laws |  | (71) | (243)
Other | 272 | (168) | (469)
Total income tax provision | $ 4,382 | $ 3,289 | $ 10,367
Tax Jurisdiction of Domicile [Extensible Enumeration] | UNITED STATES | UNITED STATES | UNITED STATES
Federal statutory rate (in percentage) | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit (in percentage) | 1.50% | 1.50% | 1.30%
Research and development credit (in percentage) | (1.10%) | (0.50%) | (1.30%)
Investment tax credit (in percentage) |  | (4.70%) |
Change in unrecognized tax benefits (in percentage) | (0.40%) | 0.20% | 0.50%
Non-deductible expenses: |  |  |
Long-term retirement plan (in percentage) | 6.30% |  |
Other (in percentage) | (1.20%) | (0.80%) | (0.30%)
Cross-border tax laws (in percentage) |  | (0.30%) | (0.50%)
Other (in percentage) | 1.70% | (0.80%) | (0.80%)
Effective tax rate (in percentage) | 27.80% | 15.60% | 19.90%

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