Note 24 - Share-based Compensation Expenses - Options Issued and Outstanding (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Options outstanding, number of underlying shares (in shares)	755,216	835,216
Options outstanding, weighted average remaining contractual life (Year)	332 days	1 year 54 days	2 years 14 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.43	$ 2.49
Option exercisable, number of underlying shares (in shares)	755,216	835,216
Option exercisable, weighted average remaining contractual life (Year)	332 days	1 year 54 days	2 years 14 days
Option exercisable, weighted average exercise price (in dollars per share)	$ 2.43	$ 2.49
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)
Options outstanding, forfeited, weighted average exercise price (in dollars per share)
Options outstanding, expired (in shares)	(477,240)	(80,000)
Options outstanding, expired, weighted average exercise price (in dollars per share)	$ 2.10	$ 3.08
Option exercisable, granted/vested, weighted average exercise price (in dollars per share)	$ 2.10	$ 3.08
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	755,216	835,216
Options outstanding, weighted average remaining contractual life (Year)	332 days	1 year 54 days	2 years 14 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 3	$ 2.43	$ 2.49
Option exercisable, number of underlying shares (in shares)	755,216	835,216	835,216	277,976
Option exercisable, weighted average exercise price (in dollars per share)	$ 3	$ 2.43	$ 2.49