Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Note 9 - Realignment of Goals and Objectives and New Development Focus (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Restructuring and Related Cost, Expected Cost, Total			$ 9.6
Restructuring Plan [Member]
Payments for Restructuring		$ 5.5
Restructuring Plan [Member] \| General and Administrative Expense [Member]
Restructuring Charges, Total	$ 0.5
Restructuring Plan [Member] \| Employee Severance [Member]
Restructuring and Related Cost, Expected Cost, Total			5.7
Restructuring Plan [Member] \| Accelerated Non-Cash Stock Option Expense [Member]
Restructuring and Related Cost, Expected Cost, Total			$ 3.9