Note 3 - Revenue from Contracts with Customers 2 (Details Textual)
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Feb. 29, 2020 |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
1 year
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
1 year
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-03-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
1 year
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-03-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
1 year
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-03-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
1 year
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-03-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
1 year
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| Minimum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
10 years
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| Maximum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) |
0 years
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