Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis (USD $)	Sep. 30, 2013	Dec. 31, 2012
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	$ 429,577,771	$ 439,710,050
Investment in derivative		642,600
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	38,766,344	51,898,872
US Government Agencies Debt Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	38,766,344	51,898,872
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	45,334,231	53,846,484
US States and Political Subdivisions Debt Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	45,334,231	53,846,484
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	225,909,172	227,443,614
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	1,955,000	3,834,470
Corporate Debt Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	227,864,172	231,278,084
Foreign [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	54,099,444	54,736,870
Foreign [Member] | Fair Value, Inputs, Level 3 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	1,882,500
Foreign [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	55,981,944	54,736,870
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	3,499,314	4,748,934
Asset-backed Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	3,499,314	4,748,934
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	5,214,768	6,837,027
Commercial Mortgage Backed Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	5,214,768	6,837,027
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	47,628,339	34,977,142
Residential Mortgage Backed Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	47,628,339	34,977,142
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	324,831
Redeemable Preferred Stock [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	324,831
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	324,831
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	420,451,612	434,488,943
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	3,837,500	3,834,470
Debt Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	424,613,943	438,323,413
US Agencies [Member] | Fair Value, Inputs, Level 1 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	687,000	681,300
US Agencies [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	687,000	681,300
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	326,086	321,337
Mutual Funds [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	326,086	321,337
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	3,431,916
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	384,000	384,000
Common Stock [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	3,815,916	384,000
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	134,826
Nonredeemable Preferred Stock [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	134,826
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	4,579,828	1,002,637
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	384,000	384,000
Equity Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Available-for-sale Securities	4,963,828	1,386,637
Fair Value, Inputs, Level 3 [Member]
Note 5 - Fair Values of Financial Instruments (Details) - Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items]
Investment in derivative		$ 642,600