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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 87,000 | $ 81,000
Reserves not deductible until paid | 300,000 | 289,000
Net operating loss carryforwards |  |
Federal | 2,764,000 | 2,654,000
State | 537,000 | 768,000
Federal tax credit | 398,000 | 338,000
Other | 12,000 | 11,000
Gross deferred tax assets | 4,098,000 | 4,141,000
Less valuation allowance | (1,453,000) | (1,651,000)
Deferred tax assets net of valuation allowance | 2,645,000 | 2,490,000
Deferred tax liabilities: |  |
Property and equipment | (2,399,000) | (2,307,000)
Other | (238,000) | (175,000)
Gross deferred tax liabilities | (2,637,000) | (2,482,000)
Net deferred tax asset | $ 8,000 | $ 8,000

X
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