Note 16 - Restructuring (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Costs	$ 1,966	$ 1,664		$ 4,970	$ 2,058
Minimum [Member] | Scenario, Forecast [Member]
Restructuring Costs			$ 4,000
Maximum [Member] | Scenario, Forecast [Member]
Restructuring Costs			$ 5,000
Severance and Non-cash Lease Impairment Costs [Member]
Restructuring Costs	$ 1,700			$ 5,000	$ 2,100