Note 3 - Contracts With Customers 2 (Details Textual) - Long-term Contract with Customer [Member] - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01	Dec. 31, 2020 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 205,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year