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Note 8 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 01, 2016
Federal, state and foreign loss carryforwards $ 794,000 $ 1,440,000  
Deferred revenue 11,000 30,000  
Federal and state tax credits 757,000 642,000  
Other 402,000 823,000  
Total deferred tax asset 1,964,000 2,935,000  
Less valuation allowance (1,964,000) (2,935,000) $ (2,900,000)
Net deferred tax asset