Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, par value (in dollars per share)		$ 0.01
Preferred stock, liquidation value (in dollars per share)		$ 1,000
Preferred stock, shares authorized (in shares)		40,040,000
Preferred stock, shares issued (in shares)		30,852
Preferred stock, shares outstanding (in shares)		30,852
Common stock Class A, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock Class A, shares authorized (in shares)	120,000,000	120,000,000
Common stock Class A, shares issued (in shares)	31,277,723	30,278,432
Common stock Class A, shares outstanding (in shares)	31,277,723	30,278,432