Note 23 - Share-based Compensation Expenses - Options Issued and Outstanding (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Options outstanding, number of underlying shares (in shares)	277,976
Options outstanding, weighted average remaining contractual life (Year)	240 days	332 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 3
Option exercisable, number of underlying shares (in shares)	277,976
Option exercisable, weighted average remaining contractual life (Year)	240 days	332 days
Option exercisable, weighted average exercise price (in dollars per share)	$ 3
Options outstanding, granted/vested (in shares)	0
Options outstanding, granted/vested, weighted average exercise price (in dollars per share)	$ 0
Options outstanding, forfeited (in shares)	0
Options outstanding, forfeited, weighted average exercise price (in dollars per share)	$ 0
Options outstanding, exercised (in shares)	0
Options outstanding, exercised, weighted average exercise price (in dollars per share)	$ 0
Options outstanding, number of underlying shares (in shares)	277,976	277,976
Options outstanding, weighted average exercise price (in dollars per share)	$ 3	$ 3
Option exercisable, number of underlying shares (in shares)	277,976	277,976
Option exercisable, weighted average exercise price (in dollars per share)	$ 3	$ 3