Note 12 - Fair Value Measurements - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Contingent consideration	$ 720	$ 720
Total liabilities	720	2,675
Convertible Notes Payable [Member]
Convertible note payable		1,955
Fair Value, Inputs, Level 1 [Member]
Contingent consideration
Total liabilities
Fair Value, Inputs, Level 1 [Member] | Convertible Notes Payable [Member]
Convertible note payable
Fair Value, Inputs, Level 2 [Member]
Contingent consideration
Total liabilities
Fair Value, Inputs, Level 2 [Member] | Convertible Notes Payable [Member]
Convertible note payable
Fair Value, Inputs, Level 3 [Member]
Contingent consideration	720	720
Total liabilities	$ 720	2,675
Fair Value, Inputs, Level 3 [Member] | Convertible Notes Payable [Member]
Convertible note payable		$ 1,955