Note 10 - Fair Value Measurements - Fair Value Measurements of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets		$ 758	$ 2,494
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets		5,336	5,336
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Non-recurring fair value measurements	[1]	5,336	5,336
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Money market funds	[2]	$ 758	$ 2,494

[1] Included in assets held for sale on the Company's Condensed Consolidated Balance Sheets. Refer to Note 6 for further information.

[2] Included in cash and cash equivalents on the Company's Condensed Consolidated Balance Sheets. The carrying amount of money market funds is a reasonable estimate of fair value due to the short-term maturity.