Note 7 - Accrued Liabilities and Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedule of Accrued Expenses and Other Current Liabilities [Table Text Block]

	September 30,		December 31,
	2019		2018
Employee compensation expense	$	3,148	$	3,130
Project asset costs		15,396		2,014
Valve installation incentive (1)		-		2,000
Accrued legal services		534		313
Other accrued liabilities		833		896
Total accrued liabilities and other current liabilities	$	19,911	$	8,353