Note 5 - Stockholders' Equity (Detail)	Dec. 31, 2012	Dec. 31, 2011
Capital Units, Authorized	135,000,000
Preferred Stock, Shares Authorized	20,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	279,200
Common Class A [Member]
Common Stock, Shares Authorized	15,000,000	15,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	5,000,000
Common Stock, Capital Shares Reserved for Future Issuance	1,000,000	1,000,000
Common Class B [Member]
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Capital Shares Reserved for Future Issuance	7,892,742	8,385,281