Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	2,445,598	2,445,598
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	47,000,000	47,000,000
Common stock, issued (in shares)	20,847,461	20,776,558
Common stock, outstanding (in shares)	20,847,461	20,776,558
Treasury stock, shares (in shares)	1,697	7,895