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Note 7 - Stockholders' Equity (Tables)
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6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2012
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| Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | Following is a summary of the activity of options to an independent director:
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] | The exercise price for options outstanding at June 30, 2012, is as follows:
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The assumptions used in calculating the fair value of options granted using the Black-Scholes option-pricing model are as follows:
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