Note 4 - Net Income Per Common Share - Reconciliation of Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Weighted average number of common shares outstanding - basic (in shares)	3,283,177	3,239,306	3,283,177	3,239,306
Effect of dilutive securities (in shares)	101,131	50,373	97,001	46,196
Weighted average number of common shares and potential common shares - diluted (in shares)	3,384,308	3,289,679	3,380,178	3,285,502
Net income	$ 1,125	$ 1,850	$ 4,199	$ 5,640
Net income per common share - basic (in dollars per share)	$ 0.34	$ 0.57	$ 1.28	$ 1.74
Net income per common share - diluted (in dollars per share)	$ 0.33	$ 0.56	$ 1.24	$ 1.72