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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 65,000 | $ 60,000
Reserves not deductible until paid | 133,000 | 187,000
Net operating loss carryforwards |  |
Federal | 1,737,000 | 1,794,000
State | 704,000 | 556,000
Federal tax credit | 556,000 | 476,000
Other | 162,000 |
Gross deferred tax assets | 3,357,000 | 3,073,000
Less valuation allowance | (1,881,000) | (1,313,000)
Deferred tax assets net of valuation allowance | 1,476,000 | 1,760,000
Deferred tax liabilities: |  |
Property and equipment | (1,438,000) | (1,582,000)
Other | (30,000) | (170,000)
Gross deferred tax liabilities | (1,468,000) | (1,752,000)
Net deferred tax asset | $ 8,000 | $ 8,000

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