Note 7 - Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
2019, (excluding the three months ended March 31, 2019) gross	$ 7,460
2019 (excluding the three months ended March 31, 2019), payments received from sublease	(5,201)
2019 (excluding the three months ended March 31, 2019), net lease payment	2,259
2020, gross	9,999
2020, payments received from sublease	(7,115)
2020, net lease payment	2,884
2021, gross	10,011
2021, payments received from sublease	(7,315)
2021, net lease payment	2,696
2022, gross	4,254
2022, payments received from sublease	(3,112)
2022, net lease payment	1,142
2023, gross	73
2023, payments received from sublease
2023, net lease payment	73
Thereafter, gross	13
Thereafter, payments received from sublease
Thereafter, net lease payment	13
Gross	31,810
Sublease income, payments received from sublease	(22,743)
Lease payments, net lease payment	9,067
Less imputed interest, gross	(4,068)
Total, net	$ 27,742