Note 3 - Contracts in Progress 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 $ in Millions	Dec. 31, 2019 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 3.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year