Note 1 - Business and Basis of Presentation (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ 209,000	$ (1,537,000)
Effective Income Tax Rate Reconciliation, Percent, Total	(4.18%)
Effective UK Corporate Tax Rate	19.00%
US Treasury Securities [Member]
Cash Equivalents, US Treasury Securities Collateral for Reverse Repurchase Agreements, Percent of Principal	102.00%