Note 2 - Significant Accounting Policies 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01	Dec. 31, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	1 year
Revenue, Remaining Performance Obligation, Amount	$ 683,000
Service [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	1 year
Revenue, Remaining Performance Obligation, Amount	$ 183,000
License [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	1 year
Revenue, Remaining Performance Obligation, Amount	$ 500,000