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 |