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Note 1 - Significant Accounting Policies (Detail) - Calculation of Earnings Per Share (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income (loss) (in Dollars) $ (1,452) $ (1,002) $ (4,251) $ 640 $ 2,245 $ 11,213 $ (1,655) $ 2,464 $ 6,065 $ (14,267) $ 3,289
Denominator for basic income (loss) per share – weighted-average shares                 14,742 14,689 14,374
Effect of dilutive securities:                      
Equivalent shares issuable upon conversion of unvested restricted stock                 66   128
Equivalent shares issuable upon conversion of unvested employee stock options                     3
Denominator for diluted income (loss) per share adjusted weighted-average shares and assumed conversions                 14,808 14,689 14,505
Basic income (loss) per share (in Dollars per share)                 $ 0.41 $ (0.97) $ 0.23
Diluted income (loss) per share (in Dollars per share)                 $ 0.41 $ (0.97) $ 0.23