Note 9 - Estimated Liability for Appeals - Activity in Estimated Liability for Appeals (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance	$ 30,787	$ 30,787	$ 30,755
Provision		2,166	4,783
Appeals found in providers favor		(2,794)	(4,751)
Release of estimated liability	(8,400)	(8,436)
Balance		21,723	30,787	30,755
Original RAC Contract [Member]
Balance	27,816	27,816	28,427
Provision		108	2,054
Appeals found in providers favor		(108)	(2,665)
Release of estimated liability		(8,436)
Balance		19,380	27,816	28,427
RAC 4 Contract [Member]
Balance
Provision		20
Appeals found in providers favor
Release of estimated liability
Balance		20
Commercial Contracts [Member]
Balance	$ 2,971	2,971	2,328
Provision		2,038	2,729
Appeals found in providers favor		(2,686)	(2,086)
Release of estimated liability
Balance		$ 2,323	$ 2,971	$ 2,328