Note 11- Share-based Compensation - Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Outstanding, shares, beginning balance (in shares) | shares	2,868,947
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 5.35
Granted, shares (in shares) | shares	118,266
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 7.23
Exercised, shares (in shares) | shares	(318,548)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 4.15
Forfeited, shares (in shares) | shares	(40,000)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 7.18
Outstanding, shares, ending balance (in shares) | shares	2,628,665
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 5.55
Outstanding, weighted-average remaining contractual term (Year)	5 years 1 month 9 days
Vested and exercisable, shares (in shares) | shares	2,288,000
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 5.36
Vested and exercisable, weighted-average remaining contractual term (Year)	4 years 7 months 6 days