Note 6 - Operating Lease Right-of-use Asset, Net (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Notes Tables

Lease, Cost [Table Text Block]

	Three months ended September 30,		Nine months ended September 30,
	2019		2019
Straight-line rent expense recognized for operating lease	$	150	$	450
Variable rent expense recognized for operating lease		63		202
Total rent expense	$	213	$	652
Weighted average remaining lease term (in years)				2.25
Weighted average discount rate				12.05	%

Schedule of Operating Leases Cash Flow Information [Table Text Block]

	Three months ended September 30,		Nine months ended September 30,
	2019		2019
Cash paid for amounts included in the measurement of lease liabilities	$	153	$	459
Cash Lease Expense (imputed interest expense component of net income)		39		126

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

	Operating Lease
	September 30, 2019
Remainder of 2019	$	153
Years ending December 31,
2020		630
2021		649
Total undiscounted lease payments		1,432
Less imputed interest		172
Total operating lease liabilities	$	1,260

Lessee, Operating Lease, Disclosure [Table Text Block]

Years ending December 31,
2019	$	612
2020		630
2021		649
Total	$	1,891

Years ending December 31:
2019	$	612
2020		630
2021		649
Total	$	1,891