Note 3 - Revenue Recognition - Remaining Performance Obligations 2 (Details)	Feb. 29, 2020 USD ($)
Revenue, remaining performance obligation, amount	$ 155,010
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-01
Revenue, remaining performance obligation, amount	$ 52,743
Revenue, remaining performance obligation, period (Year)	273 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-12-01
Revenue, remaining performance obligation, amount	$ 27,252
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-12-01
Revenue, remaining performance obligation, amount	$ 18,667
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-12-01
Revenue, remaining performance obligation, amount	$ 13,995
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-12-01
Revenue, remaining performance obligation, amount	$ 11,864
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-12-01
Revenue, remaining performance obligation, amount	$ 30,489
Revenue, remaining performance obligation, period (Year)	1 year