Note 2 - Fair Value Measurement - Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Contingent purchase price consideration	$ 2,593	$ 1,293
Total	3,475	1,293
Fair Value, Inputs, Level 1 [Member]
Contingent purchase price consideration
Total
Fair Value, Inputs, Level 2 [Member]
Contingent purchase price consideration
Total
Fair Value, Inputs, Level 3 [Member]
Contingent purchase price consideration	3,475	1,293
Total	$ 3,475	$ 1,293