Note 10 - Intangible Assets, Net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Amortization of Intangible Assets, Total	$ 382,000	$ 1,226,000
Impairment of Intangible Assets, Finite-lived	$ 3,330,000	$ 2,552,000
Finite-Lived Intangible Asset, Useful Life	2 years 175 days
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 18,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	9,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	$ 18,000