Note 8 - Stockholder's Equity (Details Textual) - $ / shares							3 Months Ended
	Mar. 05, 2020	Dec. 05, 2019	Feb. 22, 2019	May 22, 2017	Aug. 18, 2015	May 06, 2013	Feb. 29, 2020	Feb. 28, 2019
Common Stock, Dividends, Per Share, Declared (in dollars per share)							$ 0.03	$ 0.03
Preferred Stock Dividends Number of Rights Declared (in shares)						1
Preferred Stock Dividends Number of Rights Minimum Percent of Common Stock that must be Acquired to Make Rights Exercisable						15.00%
Preferred Stock Dividends Number of Rights Minimum Percent of Common Stock that Must be Acquired to Make Rights Exercisable, Institutional Investors						20.00%
Right to Purchase Series A Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0.90
Class of Warrant or Right, Term (Year)			9 years	7 years	5 years
Special Cash Distribution [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.01
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)		$ 0.02
Special Cash Distribution [Member] | Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.01