Note 2 - Contracts With Clients 2 (Details Textual) - Long-term Contract with Customer [Member]	Sep. 30, 2020 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 124,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	3 months
Revenue, Remaining Performance Obligation, Amount	$ 51,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Amount	$ 73,000