Note 14 - Net (Loss) Income Per Share - Common Shares Excluded from Calculation of Diluted Net (Loss) Income Per Share (Details) - shares shares in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive securities (in shares)		6,577	6,413	5,219
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)		5,811	3,794	2,395
Contingent Consideration Liability [Member]
Antidilutive securities (in shares)	[1]	766	2,619	2,824

[1] Calculated as follows: (a) the contingent consideration liability balance at December 31 divided by (b) the closing stock price of our common stock on the last day of trading of the fiscal year.