Condensed Consolidated Balance Sheets - Unaudited (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Liabilities and equity
Investments at fair value	$ 3,354	$ 25,071
Par (in dollars per share)	$ 0.001	$ 0.001
Authorized (in shares)	10,000,000	10,000,000
Outstanding (in shares)	0	0
Issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	23,140,000	23,125,000
Common stock, shares outstanding (in shares)	23,138,000	23,070,000
Treasury stock, common shares held (in shares)	1,000	55,000