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Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value $ 21,016 $ 49,211
Mutual Funds [Member] | Estimate of Fair Value Measurement [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value   27,582
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value   27,582
Mutual Funds [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Gross Unrealized Gains (pre-tax)   337
Gross Unrealized Losses (pre-tax)   9
Municipal Bond Securities [Member] | Estimate of Fair Value Measurement [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value 21,016 21,629
Municipal Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value 21,016 21,629
Municipal Bond Securities [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Gross Unrealized Gains (pre-tax) 241 862
Gross Unrealized Losses (pre-tax) 552 128
Total [Member] | Estimate of Fair Value Measurement [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value 21,016 49,211
Total [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value   27,582
Total [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Fair Value 21,016 21,629
Total [Member]
    
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) - Summary of short-term investments as follows [Line Items]    
Gross Unrealized Gains (pre-tax) 241 1,199
Gross Unrealized Losses (pre-tax) $ 552 $ 137