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Note 11 - Employee Benefit Plan (Details Textual) - USD ($)
12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Defined Contribution Plan Employers Matching Contribution Vesting Period 3 years    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 25.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 1.50%    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 66,000 $ 62,000 $ 60,000