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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 2,930 $ 2,624
Unamortized loan costs $ 10,862 $ 12,049
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, shares authorized (in shares) 100,000 100,000
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) 17,814,672 17,812,755
Common stock, shares outstanding (in shares) 17,814,672 17,812,755
Series A Cumulative Non-Voting Preferred Stock [Member]    
Preferred stock, shares authorized (in shares) 140 140
Preferred stock, dividend rate, percentage 12.50% 12.50%