Note 22 - Stock Option Activity (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Stock Option Activity [Abstract]
Shares Under Option, Outstanding | shares	7,724,426
Shares Under Option, Expired | shares	438,538
Shares Under Option, Exercised | shares	44,581
Shares Under Option, Forfeited | shares	6,858
Shares Under Option, Outstanding | shares	7,234,449
Shares Under Option, Exercisable | shares	6,861,191
Shares Under Option, Expected to vest | shares	373,258
Weighted Average Exercise Price Per Share, Outstanding | $ / shares	$ 8.10
Weighted Average Exercise Price Per Share, Expired | $ / shares	22.01
Weighted Average Exercise Price Per Share, Exercised | $ / shares	3.90
Weighted Average Exercise Price Per Share, Forfeited | $ / shares	3.90
Weighted Average Exercise Price Per Share, Outstanding | $ / shares	7.29
Weighted Average Exercise Price Per Share, Exercisable | $ / shares	7.40
Weighted Average Exercise Price Per Share, Expected to vest | $ / shares	$ 5.21
Weighted Average Remaining Contractual Life, Outstanding	3 years 7 months 2 days
Weighted Average Remaining Contractual Life, Exercisable	3 years 6 months 21 days
Weighted Average Remaining Contractual Life, Expected to vest	4 years 1 month 17 days
Aggregate Intrinsic Value, Outstanding | $	$ 5
Aggregate Intrinsic Value, Exercisable | $	$ 4