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Note 20 - Lattice-based Valuation of Option Grants (Details) - Lattice-based Valuation [Member] - Stock Options [Member]
Jul. 27, 2020
$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Weighted-average fair value of options granted $ 6.57
Range of risk-free interest rates 0.11%
Range of risk-free interest rates 0.30%
Weighted-average term 5 years 6 months 25 days
Weighted-average volatility 98.00%
Weighted-average expected dividend yield 0.00%