Note 6 - Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Period Reclassification Adjustment		$ 60,500
Impairment of Intangible Assets (Excluding Goodwill), Total	$ 0	$ 0	$ 47,014
ClariPhy Communications Inc.[Member]
Impairment of Intangible Assets (Excluding Goodwill), Total			47,014
ClariPhy Communications Inc.[Member] | Cost of Sales [Member]
Impairment of Intangible Assets (Excluding Goodwill), Total			10,174
ClariPhy Communications Inc.[Member] | Research and Development Expense [Member]
Impairment of Intangible Assets (Excluding Goodwill), Total			$ 36,840