Note 2 - Summary of Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Prepaid expenses and other current assets (a)		$ 886		$ 1,760
Operating lease right-of-use assets		1,252
Other assets (b)		477		552
Other accrued liabilities (c)		140		164
Operating lease liability		930
Deferred rent				184
Operating lease liability - non-current		$ 505
Accounting Standards Update 2016-02 [Member]
Prepaid expenses and other current assets (a)	[1]		$ (49)
Operating lease right-of-use assets			2,239
Other assets (b)	[2]		(2)
Other accrued liabilities (c)	[3]		(101)
Operating lease liability			1,063
Deferred rent			(184)
Operating lease liability - non-current			$ 1,410

[1] Represents current portion of prepaid fleet leasing costs reclassified to Operating lease right-of-use assets.

[2] Represents noncurrent portion of prepaid fleet leasing costs reclassified to Operating lease right-of-use assets.

[3] Represents current portion of deferred rent and lease incentive liability reclassified to Operating lease liability.