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Note 8 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Vacation accrual | $ 3,908 | $ 3,814
Allowance for doubtful accounts |  | 734
Reserve for excess and obsolete inventory | 152,680 | 241,624
Business tax credit carryover | 30,935 |
Deferred compensation | 17,943 | 24,451
Net operating loss carryover | 5,889,088 | 5,184,992
Excess of book over tax depreciation | (300,805) | (33,182)
Excess of book over tax work in progress | (847,290) |
Valuation allowance | (5,285,222) | (5,422,433)
| (338,763) |
Long-term deferred tax asset |  |
Long-term deferred tax liability | (338,763) |
| $ (338,763) |

X
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