Note 14 - Share-based Compensation - Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Lower exercise price range (in dollars per share)	$ 6.79
Upper exercise price range (in dollars per share)	$ 7.33
Number of options outstanding (in shares) | shares	1,300,000
Options outstanding weighted average remaining contractual life (Year)	1 year
Options outstanding weighted average exercise price (in dollars per share)	$ 6.85
Options outstanding aggregate intrinsic value | $
Number of options vested and exercisable (in shares) | shares	1,300,000
Options vested and exercisable weighted average remaining contractual life (Year)	1 year
Options vested and exercisable weighted average exercise price (in dollars per share)	$ 6.85
Options vested and exercisable aggregate intrinsic value | $