Note 23 - Stock Option Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Stock Option Activity [Abstract]
Shares Under Option, Outstanding | shares	6,843,079
Shares Under Option, Granted | shares	2,917,456
Shares Under Option, Exercised | shares	2,019,187
Shares Under Option, Forfeited | shares	16,922
Shares Under Option, Outstanding | shares	7,724,426
Shares Under Option, Exercisable | shares	7,024,347
Shares Under Option, Expected to vest | shares	700,080
Weighted Average Exercise Price Per Share, Outstanding | $ / shares	$ 10.96
Weighted Average Exercise Price Per Share, Granted | $ / shares	5.86
Weighted Average Exercise Price Per Share, Exercised | $ / shares	14.51
Weighted Average Exercise Price Per Share, Forfeited | $ / shares	12.50
Weighted Average Exercise Price Per Share, Outstanding | $ / shares	8.10
Weighted Average Exercise Price Per Share, Exercisable | $ / shares	8.41
Weighted Average Exercise Price Per Share, Expected to vest | $ / shares	$ 4.97
Weighted Average Remaining Contractual Life, Outstanding	4 years 9 months 29 days
Weighted Average Remaining Contractual Life, Exercisable	4 years 8 months 8 days
Weighted Average Remaining Contractual Life, Expected to vest	6 years 2 months 26 days
Aggregate Intrinsic Value, Outstanding | $	$ 19,420
Aggregate Intrinsic Value, Exercisable | $	16,860
Aggregate Intrinsic Value, Expected to vest | $	$ 2,560