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Note 20 - Black-Scholes Valuation of Option Grants (Details) - Black-Scholes Valuation [Member] - $ / shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted-average fair value of options granted $ 1.50 $ 1.73
Risk-free interest rate 2.43% 2.47%
Expected option lives 3 years 8 months 12 days 4 years 6 months
Expected volatility 98.00% 90.00%
Expected dividend yield 0.00% 0.00%