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Note 11 - Stockholders' Equity - Valuation Assumptions (Details) - Employee Stock Option [Member]
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Risk-free interest rate 2.80% 2.00%
Dividend yield 0.00% 0.00%
Volatility 70.50% 80.20%
Expected life (Year) 6 years 6 years