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Note 6 - Available-for-Sale Investments (Tables)
9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
 
Amortized cost
 
Fair value
 
September 30,
2015
 
December 31,
2014
 
September 30,
2015
 
December 31,
2014
Bonds, notes and other securities:
                     
U.S. government and agencies
$
573
 
$
759
 
$
573
 
$
759
Total short-term investments
$
573
 
$
759
 
$
573
 
$
759
Asset-backed securities
$
39
 
$
42
 
$
35
 
$
38
Total long-term investments
$
39
 
$
42
 
$
35
 
$
38
Investments Classified by Contractual Maturity Date [Table Text Block]
Less than one year
$545
Due in 1-5 years
28
Due in 5-10 years
 
Due after 10 years (1)
35
Total
$608