Note 10 - Net Income Per Share - Weighted Average Number of Shares Used to Compute Net EPS (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic weighted average common shares outstanding during the year (in shares)	7,190	7,102	7,028
Weighted average common equivalent shares due to stock options and restricted stock units (in shares)	85	104	147
Diluted weighted average common shares outstanding during the year (in shares)	7,275	7,206	7,175