Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Valuation Allowance [Line Items]
Income Tax Expense (Benefit)		$ (15,406)	$ 7,498	$ (872)	$ 22,484
Income benefit, measurement period adjustment				$ (2,105)
Effective income tax rate excluding the impact of any proforma items, Percent		19.60%	33.20%	20.50%	32.10%
New Jersey Division of Taxation [Member]
Valuation Allowance [Line Items]
Discrete Income Tax Benefit Attributable to Valuation Allowance Release		$ 11,437		$ 11,437
Benefit for Revaluing State Net Deferred Tax Assets		$ (752)		$ (752)
New Jersey Division of Taxation [Member] | Scenario, Forecast [Member]
Valuation Allowance [Line Items]
Non Cash Charge	$ 1,600