Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Allowance for doubtful accounts	$ 3,356,000	$ 2,833,000
Unamortized debt discount, current	0	0
Deferred Costs, Current	136,000	0
Unamortized debt discount, noncurrent	0	0
Deferred Costs, Noncurrent	$ 401,000	$ 452
Stockholders' Equity Note [Abstract]
Common stock, shares issued	31,443,622	32,093,294
Common stock, shares outstanding	31,443,622	32,093,294
Treasury stock, shares	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (per share)	$ 0.10	$ 0.10
Common stock, shares authorized	120,000,000	60,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares authorized	500,000	500,000
Preferred stock, par value (per share)	$ 0.10	$ 0.10