Note 12 - Investments and Fair Value Measurements - Fair Value Hierarchy for Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets, fair value disclosure	$ 539	$ 16
Liabilities, fair value disclosure	230	401
Derivative Financial Instruments, Liabilities [Member]
Liabilities, fair value disclosure	230	356
Contingent Consideration [Member]
Liabilities, fair value disclosure		45
Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure	539	16
Liabilities, fair value disclosure
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member]
Liabilities, fair value disclosure
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration [Member]
Liabilities, fair value disclosure
Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure
Liabilities, fair value disclosure	230	356
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member]
Liabilities, fair value disclosure	230	356
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration [Member]
Liabilities, fair value disclosure
Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure
Liabilities, fair value disclosure		45
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]
Liabilities, fair value disclosure
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member]
Liabilities, fair value disclosure		45
Money Market Funds [Member]
Assets, fair value disclosure	16	16
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure	16	16
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure
Certificates of Deposit [Member]
Assets, fair value disclosure	523
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure	523
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure