Note 2 - Income Per Share - Calculation of Net Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net (loss) income	$ (39)	$ 4,352
Denominator:
Basic weighted average shares outstanding (in shares)	18,256	18,147
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested restricted stock (in shares)	80	125
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions (in shares)	18,336	18,272
Basic and diluted net (loss) income per share (in dollars per share)	$ 0	$ 0.24