Note 13 - Equity-based Compensation - Stock Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Outstanding awards (in shares)	2,183,000
Outstanding, weighted-average exercise price (in dollars per share)	$ 4.03
Outstanding, weighted-average remaining contractual life (Year)	6 years 109 days		6 years 219 days
Outstanding, aggregate intrinsic value	$ 37		$ 43
Options granted (in shares)	20,000	0
Options granted, weighted-average exercise price (in dollars per share)	$ 0.57
Options forfeited/cancelled (in shares)	(100,000)
Options forfeited/cancelled, weighted-average exercise price (in dollars per share)	$ 8.12
Outstanding awards (in shares)	2,099,000		2,183,000
Outstanding, weighted-average exercise price (in dollars per share)	$ 3.81		$ 4.03
Vested and expected to vest (in shares)	2,081,000
Vested and expected to vest, weighted-average exercise price (in dollars per share)	$ 3.83
Vested and expected to vest, weighted-average remaining contractual life (Year)	6 years 109 days
Vested and expected to vest, aggregate intrinsic value	$ 36
Vested (in shares)	1,825,000
Vested, weighted-average exercise price (in dollars per share)	$ 4.08
Vested, weighted-average remaining contractual life (Year)	6 years 14 days
Exercisable (in shares)	1,825,000
Exercisable, weighted-average exercise price (in dollars per share)	$ 4.08
Exercisable, weighted-average remaining contractual life (Year)	6 years 14 days
Restricted Stock Units (RSUs) [Member]
Restricted stock units vested (in shares)	(3,000)
Restricted stock units vested, weighted-average exercise price (in dollars per share)
Restricted stock units cancelled (in shares)	(1,000)