Note 24 - Share-based Compensation Expenses - Options Issued and Outstanding (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Options outstanding, number of underlying shares (in shares)	755,216
Options outstanding, weighted average remaining contractual life (Year)	328 days	1 year 54 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.43
Option exercisable, number of underlying shares (in shares)	755,216
Option exercisable, weighted average remaining contractual life (Year)	328 days	1 year 54 days
Option exercisable, weighted average exercise price (in dollars per share)	$ 2.43
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)	755,216	755,216
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.43	$ 2.43
Option exercisable, number of underlying shares (in shares)	755,216	755,216
Option exercisable, weighted average exercise price (in dollars per share)	$ 2.43	$ 2.43