Note 23 - Share-based Compensation Expenses - Options Issued and Outstanding (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Options outstanding, number of underlying shares (in shares)	835,216
Options outstanding, weighted average remaining contractual life (Year)	1 year 288 days	2 years 14 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.49
Option exercisable, number of underlying shares (in shares)	835,216
Option exercisable, weighted average remaining contractual life (Year)	1 year 288 days	2 years 14 days
Option exercisable, weighted average exercise price (in dollars per share)	$ 2.49
Options outstanding, granted/vested shares (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)	835,216	835,216
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.49	$ 2.49
Option exercisable, number of underlying shares (in shares)	835,216	835,216
Option exercisable, weighted average exercise price (in dollars per share)	$ 2.49	$ 2.49