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Note 2 - Stock-based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Stock Option Plan 1999 [Member]  
Outstanding, shares (in shares) 20,500
Outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 23
Exercised, shares (in shares) (5,500)
Exercised, weighted-average exercise price (in dollars per share) | $ / shares $ 23
Forfeited or expired, shares (in shares) 0
Forfeited or expired, weighted-average exercise price (in dollars per share) | $ / shares $ 0
Outstanding, shares (in shares) 15,000
Outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 23
Outstanding, weighted average exercise price 39 days
Outstanding, aggregate intrinsic value | $ $ 122
Exercisable, shares (in shares) 15,000
Exercisable, weighted-average exercise price (in dollars per share) | $ / shares $ 23
Exercisable, weighted average exercise price 39 days
Exercisable, aggregate intrinsic value | $ $ 122
Exercised, shares (in shares) (5,500)