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Note 17 - Stock-based Compensation - Changes in Shares Under Option Plans (Details) - $ / shares
 1 Months Ended 12 Months Ended
Sep. 30, 2016
May 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Beginning balance (in shares)     298,740 759,683 503,834
Beginning balance (in dollars per share)     $ 9.97 $ 11.36 $ 10.41
Issued (in shares) 1,500 1,500 3,000 5,000 21,000
Issued (in dollars per share)     $ 49.49 $ 46.50 $ 32.77
Virginia Heritage (in shares)     401,497
Virginia Heritage (in dollars per share)     $ 13.16
Exercised (in shares)     (77,144) (443,912) (157,313)
Exercised (in dollars per share)     $ 14.48 $ 12.03 $ 14.71
Forfeited (in shares)     (1,100) (12,380) (8,110)
Forfeited (in dollars per share)     $ 15.48 $ 29.58 $ 33.06
Expired (in shares)     (6,637) (9,651) (1,225)
Expired (in dollars per share)     $ 12.87 $ 18.19 $ 9
Ending balance (in shares)     216,859 298,740 759,683
Ending balance (in dollars per share)     $ 8.80 $ 9.97 $ 11.36