Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Weighted average common shares outstanding - basic (in shares)	10,295,447	10,473,928	10,327,095	10,470,410
Potentially dilutive securities:
Unvested shares of restricted stock and stock options (in shares)	23,268	24,983	17,652	21,907
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,318,715	10,498,911	10,344,747	10,492,317
Average number of potentially dilutive securities excluded from calculation (in shares)	19,800		18,277