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Note 4 - Share Repurchase Program (Details) - USD ($)
$ in Thousands
 12 Months Ended 25 Months Ended
Dec. 31, 2015
May. 01, 2015
Dec. 31, 2014
Jun. 02, 2016
Stockholders' Equity Note [Abstract]        
Stock repurchase plan - shares authorized to be repurchased   1,800,000   3,400,000
Total shares repurchased 2,258,929   227,974  
Cost of shares repurchased $ 9,388   $ 762  
Shares repurchased under share repurchase plan 2,225,437   216,754  
Shares repurchased under share repurchase plan - value $ 9,228   $ 722