Note 12 - Fair Value Measurements - Fair Value Measurements of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets		$ 2,494	$ 7,592
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Non-recurring fair value measurements	[1]
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Non-recurring fair value measurements	[1]
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets		5,336	6,155
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Non-recurring fair value measurements	[1]	5,336	6,155
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Money market funds	[2]	2,494	6,688
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Money market funds	[2]
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Money market funds	[2]
Bankers Acceptance [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Bank acceptance notes	[3]		904
Bankers Acceptance [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Bank acceptance notes	[3]
Bankers Acceptance [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Bank acceptance notes	[3]

[1] Included in assets held for sale on the Company's Consolidated Balance Sheets. Refer to Note 7 for further information.

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

[3] Refer to Note 4 for further information