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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts $ 3,152 $ 2,768
Unamortized loan costs $ 9,548 $ 10,134
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, dividend rate, percentage 12.50% 12.50%
Preferred stock, liquidation preferrence $ 137,500 $ 137,500
Preferred stock, shares issued (in shares) 132 132
Preferred stock, shares outstanding (in shares) 132 132
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 17,812,755 11,422,606
Common stock, shares outstanding (in shares) 17,812,755 11,422,606