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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 63 | $ 65
Reserves not deductible until paid | 6 | 7
Federal | 2,030 | 2,081
State | 579 | 494
Federal tax credit | 1,261 | 1,041
Operating lease liabilities | 337 | 345
Section 163(j) business interest expense carryforward | 682 | 269
Other | 22 | 37
Gross deferred tax assets | 4,980 | 4,339
Less valuation allowance | (2,965) | (2,488)
Deferred tax assets net of valuation allowance | 2,015 | 1,851
Deferred tax liabilities: |  |
Property and equipment | (1,670) | (1,498)
Operating lease right of use assets | (337) | (345)
Gross deferred tax liabilities | (2,007) | (1,843)
Net deferred tax asset | $ 8 | $ 8

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