Note 4 - Fair Value - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 19,964	$ 9,598
Restricted cash	1,154	969
Total assets measured at fair value	21,118	10,567
Contingent consideration	2,780	1,084
Warrant liabilities	124	2,388
Total liabilities measured at fair value	2,904	3,472
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	19,964	9,598
Restricted cash	1,154	969
Total assets measured at fair value	21,118	10,567
Contingent consideration	0	0
Warrant liabilities	0	0
Total liabilities measured at fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets measured at fair value	0	0
Contingent consideration	0	0
Warrant liabilities	0	0
Total liabilities measured at fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets measured at fair value	0	0
Contingent consideration	2,780	1,084
Warrant liabilities	124	2,388
Total liabilities measured at fair value	$ 2,904	$ 3,472