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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale securities | $ 548,817,733 | $ 479,843,448
US Treasury Securities [Member] |  |
Available for sale securities | 8,856,000 | 9,452,000
US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 97,984,000 | 126,433,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale securities | 133,796,000 | 81,128,000
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 233,563,000 | 195,302,000
Corporate Debt Securities [Member] |  |
Available for sale securities | 74,619,000 | 67,528,000
Fair Value, Recurring [Member] |  |
Available for sale securities | 548,818,000 | 479,843,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 8,856,000 | 9,452,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 539,962,000 | 470,391,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Available for sale securities | 8,856,000 | 9,452,000
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 8,856,000 | 9,452,000
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 97,984,000 | 126,433,000
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 97,984,000 | 126,433,000
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale securities | 133,796,000 | 81,128,000
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 133,796,000 | 81,128,000
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 233,563,000 | 195,302,000
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 233,563,000 | 195,302,000
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available for sale securities | 74,619,000 | 67,528,000
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 74,619,000 | 67,528,000
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | $ 0 | $ 0

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