Note 15 - Share-based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Outstanding, number of shares (in shares)	281
Outstanding, weighted average exercise price (in dollars per share)	$ 10.20
Outstanding, weighted average fair value (in dollars per share)	$ 5.32	$ 5.32
Outstanding, aggregate intrinsic value	$ 22,600		$ 573,000
Exercised, number of shares (in shares)	0
Exercised, weighted average exercise price (in dollars per share)	$ 0
Exercised, weighted average share price on date of exercise (in dollars per share)	$ 0
Exercised, aggregate intrinsic value	$ 0
Forfeited, number of shares (in shares)	0
Forfeited, weighted average exercise price (in dollars per share)	$ 0
Forfeited, aggregate intrinsic value	$ 0
Outstanding, number of shares (in shares)	281
Outstanding, weighted average exercise price (in dollars per share)	$ 10.20
Outstanding, weighted average remaining contractual life (Year)	3 years 4 months 13 days
Exercisable, number of shares (in shares)	281
Exercisable, weighted average exercise price (in dollars per share)	$ 10.20
Exercisable, weighted average remaining contractual life (Year)	3 years 4 months 13 days
Exercisable, aggregate intrinsic value	$ 22,600
Vested and expected to vest, number of shares (in shares)	281
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 10.20
Vested and expected to vest, weighted average remaining contractual life (Year)	3 years 4 months 13 days
Vested and expected to vest, aggregate intrinsic value	$ 23,000