Note 20 - Subsequent Event (Details Textual) - USD ($) $ in Thousands	1 Months Ended	4 Months Ended
	Apr. 30, 2019	Apr. 30, 2019	Apr. 18, 2019	Mar. 31, 2018
US-based Revolver and UK-based Overdraft [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 5,000
Bank of America [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 10,000
Bank of America [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Debt Instrument, Term	2 years	2 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,000	$ 10,000