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Note 9 - Stockholders' Equity (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Allocated Share-based Compensation Expense $ 133,000 $ 133,000 $ 263,000 $ 258,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options 781,000   781,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 109 days  
Proceeds from Stock Options Exercised     $ 56,000 $ 122,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in Shares) 121,184   121,184  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in Shares)     31,000