Unaudited Condensed Consolidated Balance Sheets (Parentheticals) - $ / shares shares in Thousands	Mar. 31, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000	5,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	80,000	80,000
Common stock, shares issued (in shares)	13,022	12,808
Common stock, shares outstanding (in shares)	13,012	12,798
Common stock held in treasury, at cost, shares (in shares)	10	10
Series 1 Preferred Stock [Member]
Preferred stock, shares issued (in shares)	200	200
Preferred stock, shares outstanding (in shares)	200	200
Preferred stock, liquidation preference (in dollars per share)	$ 1,175	$ 1,163
Series 2 Preferred Stock [Member]
Preferred stock, shares issued (in shares)	460	460
Preferred stock, shares outstanding (in shares)	460	460
Preferred stock, liquidation preference (in dollars per share)	$ 1,342	$ 1,328
Series 3 Preferred Stock [Member]
Preferred stock, shares issued (in shares)	289	289
Preferred stock, shares outstanding (in shares)	289	289
Preferred stock, liquidation preference (in dollars per share)	$ 736	$ 728