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Note 7 - Fair Value Measurements - Fair Value of Liabilities on a Recurring Basis (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
Warrant derivative liabilities $ 2,037
Total warrant derivative liabilities 2,037
Fair Value, Inputs, Level 1 [Member]  
Warrant derivative liabilities 0
Total warrant derivative liabilities 0
Fair Value, Inputs, Level 2 [Member]  
Warrant derivative liabilities 0
Total warrant derivative liabilities 0
Fair Value, Inputs, Level 3 [Member]  
Warrant derivative liabilities 2,037
Total warrant derivative liabilities $ 2,037