Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Weighted average common shares outstanding - basic (in shares)	10,295,836	10,471,888	10,342,919	10,468,651
Potentially dilutive securities:
Unvested shares of restricted stock and stock options (in shares)	14,856	22,569	14,549	20,369
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,310,692	10,494,457	10,357,468	10,489,020
Average number of potentially dilutive securities excluded from calculation (in shares)	19,800		17,516