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Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions - Outstanding Preferred Stock (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Shares authorized (in shares) | 5,996,240 | 6,029,100
Liquidation preference | $ 1,030,000,000 | $ 800,000,000
Preferred Stock, Par or Stated Value Per Share | $ 1 | $ 1
Series I Preferred Stock [Member] |  |
Shares authorized (in shares) | 18,400 | 18,400
Shares issued and outstanding (in shares) | 7,000 | 16,000
Liquidation preference | $ 175,000 | $ 400,000,000
Preferred Stock, Dividend Rate, Percentage | 6.00% | 6.00%
Annual dividend per depository share (in dollars per share) | $ 1.50 | $ 1.50
Preferred Stock, Par or Stated Value Per Share | $ 1 | $ 1
Series J Preferred Stock [Member] |  |
Shares authorized (in shares) | 9,000 | 9,000
Shares issued and outstanding (in shares) | 9,000 | 9,000
Liquidation preference | $ 225,000 | $ 225,000,000
Preferred Stock, Dividend Rate, Percentage | 5.50% | 5.50%
Annual dividend per depository share (in dollars per share) | $ 1.375 | $ 1.375
Preferred Stock, Par or Stated Value Per Share | $ 1 | $ 1
Series K Preferred Stock [Member] |  |
Shares authorized (in shares) | 8,050 | 8,050
Shares issued and outstanding (in shares) | 7,000 | 7,000
Liquidation preference | $ 175,000 | $ 175,000,000
Preferred Stock, Dividend Rate, Percentage | 5.625% | 5.625%
Annual dividend per depository share (in dollars per share) | $ 1.40625 | $ 1.40625
Preferred Stock, Par or Stated Value Per Share | $ 1 | $ 1
Series L Preferred Stock [Member] |  |
Shares authorized (in shares) | 10,350 |
Shares issued and outstanding (in shares) | 9,000 |
Liquidation preference | $ 225,000 |
Preferred Stock, Dividend Rate, Percentage | 5.125% |
Annual dividend per depository share (in dollars per share) | $ 1.28125 |
Preferred Stock, Par or Stated Value Per Share | $ 1 |
Total [Member] |  |
Shares issued and outstanding (in shares) | 41,200 | 32,000
Liquidation preference | $ 1,030,000 | $ 800,000,000
Series M Preferred Stock [Member] |  |
Shares authorized (in shares) | 10,580 |
Shares issued and outstanding (in shares) | 9,200 |
Liquidation preference | $ 230,000 |
Preferred Stock, Dividend Rate, Percentage | 5.25% |
Annual dividend per depository share (in dollars per share) | $ 1.3125 |
Preferred Stock, Par or Stated Value Per Share | $ 1 |

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