Condensed Consolidated Balance Sheets (unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for accounts receivable	$ 4,685	$ 4,654
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	250,000,000	250,000,000
Common stock, issued (in shares)	49,033,903	49,033,903
Common stock, outstanding (in shares)	49,033,903	49,033,903