Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,925	$ 1,922
Accumulated depreciation	22,432	21,925
Accumulated amortization	$ 6,577	$ 5,802
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	23,419,008	23,027,704
Common stock outstanding (in shares)	23,167,216	22,860,398
Treasury stock (in shares)	251,792	167,306