Note 10 - Intangible Assets, Net (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Amortization of Intangible Assets, Total	$ 4,000	$ 47,000	$ 13,000	$ 383,000
Finite-Lived Intangible Asset, Useful Life			1 year 266 days
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	4,000		$ 4,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	18,000		18,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	$ 8,000		$ 8,000