Note 11 - Commitments (Details Textual) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Nov. 30, 2012	Sep. 30, 2009	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Rent Expense			$ 294	$ 299
United States Headquarters Facility [Member]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	7 years
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years
United Kingdom Facility [Member]
Lessee Leasing Arrangements, Operating Leases, Term of Contract		15 years
Option To Cancel Lease		10 years