Note 9 - Earnings Per Common Share (Details Textual) - shares			3 Months Ended
Jul. 11, 2016	Jun. 11, 2016	Mar. 31, 2017	Mar. 31, 2016
Dividends, Common Stock, Stock, Percentge	4.00%	4.00%
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			180,810	527,149

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration