Note 18 - Stock Based Compensation - Stock Options Activities, by Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Number outstanding (in shares) | shares	50,000
Number outstanding, weighted average remaining contractual life (Year)	2 years 102 days
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 14.05
Number exercisable (in shares) | shares	50,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 14.05
Price Range 1 [Member]
Number outstanding (in shares) | shares	30,000
Number outstanding, weighted average remaining contractual life (Year)	350 days
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 13.99
Number exercisable (in shares) | shares	30,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 13.99
Price Range 2 [Member]
Number outstanding (in shares) | shares	10,000
Number outstanding, weighted average remaining contractual life (Year)	3 years 295 days
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 16.21
Number exercisable (in shares) | shares	10,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 16.21
Price Range3 [Member]
Number outstanding (in shares) | shares	10,000
Number outstanding, weighted average remaining contractual life (Year)	4 years 262 days
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 12.07
Number exercisable (in shares) | shares	10,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 12.07