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Note 2 - Income Taxes - Income Taxes Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Expected provision for federal income taxes $ 39,000 $ (178,000)
State income taxes, net of federal benefit 7,000 2,000
Non-deductible meals, entertainment, and life insurance 12,000 29,000
Research and development credit (43,000) (38,000)
Change in valuation allowance 18,000 16,000
Tax rate change adjustment related to Tax Reform Act (115,000)
Prior year true-ups and other 13,000 (14,000)
$ 46,000 $ (298,000)