Note 2 - Summary of Significant Accounting Policies 2 (Details Textual) $ in Thousands	Dec. 31, 2018 USD ($)
Subscription Contracts [Member]
Revenue, Remaining Performance Obligation, Amount	$ 20,500
Professional Services [Member]
Revenue, Remaining Performance Obligation, Amount	$ 1,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Subscription Contracts [Member]
Revenue, Remaining Performance Obligation, Percentage	21.00%
Revenue, Remaining Performance Obligation, Amount	$ 4,300
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	91 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Professional Services [Member]
Revenue, Remaining Performance Obligation, Percentage	43.00%
Revenue, Remaining Performance Obligation, Amount	$ 500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	91 days