Note 3 - Revenue Recognition - Remaining Performance Obligations 2 (Details)	Nov. 30, 2019 USD ($)
Revenue, remaining performance obligation, amount	$ 140,545
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, remaining performance obligation, amount	$ 60,435
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, remaining performance obligation, amount	$ 17,704
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, remaining performance obligation, amount	$ 17,042
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, remaining performance obligation, amount	$ 12,348
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, remaining performance obligation, amount	$ 10,217
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, remaining performance obligation, amount	$ 22,799
Revenue, remaining performance obligation, period (Year)	1 year