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Note 8 - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Common Class A [Member] | Employee Stock Option [Member] |  |
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) | 20 | 15
Common Class A [Member] | Distributed [Member] |  |
Reallocation of distributed net income as a result of conversion of dilutive stock options | $ 3 | $ 4
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding | 455 | 407
Common Class A [Member] | Diluted [Member] |  |
Distributed net income applicable to common stockholders | (5,151) | (4,216)
Distributed net income applicable to common stockholders | 5,151 | 4,216
Common Class A [Member] | Undistributed [Member] |  |
Reallocation of distributed net income as a result of conversion of dilutive stock options | 18 | 32
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding | 3,102 | 3,520
Diluted undistributed net income applicable to common stockholders | 35,119 | 36,437
Common Class A [Member] |  |
Net income applicable to common stockholders | 36,692 | 36,690
Distributed net income applicable to common stockholders | (4,693) | (3,805)
Basic undistributed net income applicable to common stockholders | $ 31,999 | $ 32,885
Weighted average number of shares outstanding used to calculate basic net income per share (in shares) | 23,522 | 23,721
Basic net income per share applicable to common stockholders (in dollars per share) | $ 1.56 | $ 1.55
Basic distributed net income per share applicable to common stockholders (in dollars per share) | (0.20) | (0.16)
Basic undistributed net income per share applicable to common stockholders (in dollars per share) | $ 1.36 | $ 1.39
Distributed net income applicable to common stockholders | $ 4,693 | $ 3,805
Weighted average number of shares from stock options (in shares) | 157 | 236
Conversion of Class B to Class A common shares outstanding (in shares) | 2,294 | 2,562
Weighted average number of shares outstanding used to calculate diluted net income per share (in shares) | 25,973 | 26,519
Diluted net income per share applicable to common stockholders (in dollars per share) | $ 1.55 | $ 1.53
Diluted distributed net income per share applicable to common stockholders (in dollars per share) | (0.20) | (0.16)
Diluted undistributed net income per share applicable to common stockholders (in dollars per share) | $ 1.35 | $ 1.37
Common Class B [Member] | Distributed [Member] |  |
Reallocation of distributed net income as a result of conversion of dilutive stock options | $ (3) | $ (4)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  |
Common Class B [Member] | Diluted [Member] |  |
Distributed net income applicable to common stockholders | $ (455) | $ (407)
Distributed net income applicable to common stockholders | 455 | 407
Common Class B [Member] | Undistributed [Member] |  |
Reallocation of distributed net income as a result of conversion of dilutive stock options | (18) | (32)
Diluted undistributed net income applicable to common stockholders | 3,102 | 3,520
Common Class B [Member] |  |
Net income applicable to common stockholders | 3,578 | 3,963
Distributed net income applicable to common stockholders | (458) | (411)
Basic undistributed net income applicable to common stockholders | $ 3,120 | $ 3,552
Weighted average number of shares outstanding used to calculate basic net income per share (in shares) | 2,294 | 2,562
Basic net income per share applicable to common stockholders (in dollars per share) | $ 1.56 | $ 1.55
Basic distributed net income per share applicable to common stockholders (in dollars per share) | (0.20) | (0.16)
Basic undistributed net income per share applicable to common stockholders (in dollars per share) | $ 1.36 | $ 1.39
Distributed net income applicable to common stockholders | $ 458 | $ 411
Weighted average number of shares from stock options (in shares) |  |
Conversion of Class B to Class A common shares outstanding (in shares) |  |
Weighted average number of shares outstanding used to calculate diluted net income per share (in shares) | 2,294 | 2,562
Diluted net income per share applicable to common stockholders (in dollars per share) | $ 1.55 | $ 1.53
Diluted distributed net income per share applicable to common stockholders (in dollars per share) | (0.20) | (0.16)
Diluted undistributed net income per share applicable to common stockholders (in dollars per share) | $ 1.35 | $ 1.37
Weighted average number of shares outstanding used to calculate basic net income per share (in shares) | 25,816 | 26,283
Weighted average number of shares outstanding used to calculate diluted net income per share (in shares) | 25,973 | 26,519
Diluted net income per share applicable to common stockholders (in dollars per share) | $ 1.55 | $ 1.53

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