Note 1 - Significant Accounting Policies and Related Matters (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 16,572	$ 15,721
Goodwill, Impairment Loss	0	0	$ 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	$ 0
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance	4,000	3,900
Operating Lease, Liability, Total	15,712
Operating Lease, Right-of-Use Asset	$ 15,208
Number of Operating Segments	1
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total				$ 7,000
Operating Lease, Right-of-Use Asset				6,500
Accrued Rent				$ (500)
ITALY
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 1,000
SPAIN
Accounts Receivable, after Allowance for Credit Loss, Current, Total	800
Geographic Distribution, Foreign [Member]
Cash, Ending Balance	$ 9,000
Minimum [Member]
Period of Payments Received from Customers	30 days
Finite-Lived Intangible Asset, Useful Life	2 years
Maximum [Member]
Period of Payments Received from Customers	60 days
Finite-Lived Intangible Asset, Useful Life	16 years