Note 7 - Stockholder's Equity (Details Textual) - $ / shares										3 Months Ended
	Mar. 15, 2017	Jan. 09, 2017	Dec. 05, 2016	Oct. 12, 2016	Sep. 06, 2016	Jul. 11, 2016	Jun. 06, 2016	Apr. 13, 2016	Mar. 03, 2016	Feb. 28, 2017	Feb. 29, 2016
Common Stock, Dividends, Per Share, Declared					$ 0.01		$ 0.01		$ 0.01	$ 0.02	$ 0.03
Common Stock, Dividends, Per Share, Cash Paid				$ 0.01		$ 0.01		$ 0.01
Quarterly Dividend [Member]
Common Stock, Dividends, Per Share, Declared			$ 0.01
Common Stock, Dividends, Per Share, Cash Paid		$ 0.01
Quarterly Dividend [Member] | Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.01
Special Cash Distribution [Member]
Common Stock, Dividends, Per Share, Declared			$ 0.01
Common Stock, Dividends, Per Share, Cash Paid		$ 0.01