Note 3 - Revenue From Contracts With Customers - Remaining Performance Obligation 2 (Details)	Nov. 30, 2020 USD ($)
Revenue, remaining performance obligation, amount	$ 1,134,811
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-01
Revenue, remaining performance obligation, period (Year)	91 days
Revenue, remaining performance obligation, amount	$ 49,539
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 191,420
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 179,694
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 147,093
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 133,812
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 433,253