Note 1 - Business and Basis of Presentation (Details Textual)		3 Months Ended		9 Months Ended
	Nov. 06, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Entity Number of Employees	210
Income Tax Expense (Benefit), Total		$ 383,000	$ 485,000	$ (1,230,000)	$ 1,182,000
Operating Lease, Right-of-Use Asset		6,662,000		6,662,000
Operating Lease, Liability, Total		7,772,000		7,772,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset						$ 7,200,000
Operating Lease, Liability, Total						$ 8,200,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Deferred Tax Assets, Valuation Allowance, Total		2,200,000		2,200,000
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]
Deferred Tax Assets, Valuation Allowance, Total		$ 1,400,000		$ 1,400,000
Quest [Member]
Proceeds from Divestiture of Businesses	$ 170,000,000