Note 7 - Revenues (Details)	Sep. 30, 2019 T
Fixed Priced Contracts
REVENUES
Remaining performance obligation, mass	300,000
Fixed Priced Contracts | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
REVENUES
Remaining performance obligation, mass	1.3
Contracts with Indexed Based Pricing Mechanisms
REVENUES
Remaining performance obligation, mass	100,000
Contracts with Indexed Based Pricing Mechanisms | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
REVENUES
Remaining performance obligation, mass	0.08