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Note 8 - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Common Class A [Member] | Employee Stock Option [Member]
Shares issuable pursuant to stock options not included since they were antidilutive (in shares)		17	10	16
Shares issuable pursuant to stock options not included since they were antidilutive (in shares)		17	10	16
Common Class A [Member] | Distributed [Member]
Reallocation of distributed net income as a result of conversion of dilutive stock options	$ 1	$ 3	$ 5	$ 7
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding	440	509	907	916
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding	440	509	907	916
Common Class A [Member] | Diluted [Member]
Distributed net income applicable to common stockholders	(6,373)	(5,266)	(11,524)	(9,482)
Distributed net income applicable to common stockholders	6,373	5,266	11,524	9,482
Diluted undistributed net income from continuing operations applicable to common stockholders	45,055	45,957	80,174	82,394
Diluted undistributed net income applicable to common stockholders	45,055	45,957	80,174	82,394
Common Class A [Member] | Undistributed [Member]
Reallocation of distributed net income as a result of conversion of dilutive stock options	9	28	28	61
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding	3,109	4,444	6,313	7,963
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding	3,109	4,444	6,313	7,963
Common Class A [Member]
Net income applicable to common stockholders	47,869	46,239	84,445	82,929
Distributed net income applicable to common stockholders	(5,932)	(4,754)	(10,612)	(8,559)
Basic undistributed net income applicable to common stockholders	$ 41,937	$ 41,485	$ 73,833	$ 74,370
Weighted average number of shares outstanding used to calculate basic net income per share (in shares)	23,700	23,770	23,611	23,748
Basic net income per share applicable to common stockholders (in dollars per share)	$ 2.02	$ 1.95	$ 3.58	$ 3.49
Basic distributed net income per share applicable to common stockholders (in dollars per share)	(0.25)	(0.20)	(0.45)	(0.36)
Basic undistributed net income per share applicable to common stockholders (in dollars per share)	$ 1.77	$ 1.75	$ 3.13	$ 3.13
Distributed net income applicable to common stockholders	$ 5,932	$ 4,754	$ 10,612	$ 8,559
Weighted average number of shares from stock options (in shares)	72	164	115	199
Conversion of Class B to Class A common shares outstanding (in shares)	1,762	2,562	2,028	2,562
Weighted average number of shares outstanding used to calculate diluted net income per share (in shares)	25,534	26,496	25,754	26,509
Diluted net income per share applicable to common stockholders (in dollars per share)	$ 2.01	$ 1.93	$ 3.56	$ 3.47
Diluted distributed net income per share applicable to common stockholders (in dollars per share)	(0.25)	(0.20)	(0.45)	(0.36)
Diluted undistributed net income per share applicable to common stockholders (in dollars per share)	$ 1.76	$ 1.73	$ 3.11	$ 3.11
Undistributed net income applicable to common stockholders	$ 41,937	$ 41,485	$ 73,833	$ 74,370
Conversion of Class B to Class A common shares outstanding (in shares)	1,762	2,562	2,028	2,562
Diluted net income per share (in dollars per share)	$ 2.01	$ 1.93	$ 3.56	$ 3.47
Diluted distributed net income per share applicable to common stockholders (in dollars per share)	(0.25)	(0.20)	(0.45)	(0.36)
Diluted undistributed net income per share applicable to common stockholders (in dollars per share)	$ 1.76	$ 1.73	$ 3.11	$ 3.11
Common Class B [Member] | Distributed [Member]
Reallocation of distributed net income as a result of conversion of dilutive stock options	$ (1)	$ (3)	$ (5)	$ (7)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
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	(440)	(509)	(907)	(916)
Distributed net income applicable to common stockholders	440	509	907	916
Diluted undistributed net income from continuing operations applicable to common stockholders	3,109	4,444	6,313	7,963
Diluted undistributed net income applicable to common stockholders	3,109	4,444	6,313	7,963
Common Class B [Member] | Undistributed [Member]
Reallocation of distributed net income as a result of conversion of dilutive stock options	(9)	(28)	(28)	(61)
Common Class B [Member]
Net income applicable to common stockholders	3,559	4,984	7,253	8,947
Distributed net income applicable to common stockholders	(441)	(512)	(912)	(923)
Basic undistributed net income applicable to common stockholders	$ 3,118	$ 4,472	$ 6,341	$ 8,024
Weighted average number of shares outstanding used to calculate basic net income per share (in shares)	1,762	2,562	2,028	2,562
Basic net income per share applicable to common stockholders (in dollars per share)	$ 2.02	$ 1.95	$ 3.58	$ 3.49
Basic distributed net income per share applicable to common stockholders (in dollars per share)	(0.25)	(0.20)	(0.45)	(0.36)
Basic undistributed net income per share applicable to common stockholders (in dollars per share)	$ 1.77	$ 1.75	$ 3.13	$ 3.13
Distributed net income applicable to common stockholders	$ 441	$ 512	$ 912	$ 923
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)	1,762	2,562	2,028	2,562
Diluted net income per share applicable to common stockholders (in dollars per share)	$ 2.01	$ 1.93	$ 3.56	$ 3.47
Diluted distributed net income per share applicable to common stockholders (in dollars per share)	(0.25)	(0.20)	(0.45)	(0.36)
Diluted undistributed net income per share applicable to common stockholders (in dollars per share)	$ 1.76	$ 1.73	$ 3.11	$ 3.11
Undistributed net income applicable to common stockholders	$ 3,118	$ 4,472	$ 6,341	$ 8,024
Conversion of Class B to Class A common shares outstanding (in shares)
Diluted net income per share (in dollars per share)	$ 2.01	$ 1.93	$ 3.56	$ 3.47
Diluted distributed net income per share applicable to common stockholders (in dollars per share)	(0.25)	(0.20)	(0.45)	(0.36)
Diluted undistributed net income per share applicable to common stockholders (in dollars per share)	$ 1.76	$ 1.73	$ 3.11	$ 3.11
Weighted average number of shares outstanding used to calculate basic net income per share (in shares)	25,462	26,332	25,639	26,310
Weighted average number of shares outstanding used to calculate diluted net income per share (in shares)	25,534	26,496	25,754	26,509
Diluted net income per share applicable to common stockholders (in dollars per share)	$ 2.01	$ 1.93	$ 3.56	$ 3.47
Diluted net income per share (in dollars per share)	$ 2.01	$ 1.93	$ 3.56	$ 3.47

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