Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Weighted average common shares outstanding - basic (in shares)	10,264,565	10,390,002
Potentially dilutive securities:
Unvested shares of restricted stock and stock options (in shares)	30,772	14,242
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,295,337	10,404,244
Average number of potentially dilutive securities excluded from calculation (in shares)	47,260	15,231