Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Allowance for doubtful accounts	$ 21,000,000.0	$ 6,969,000
Unamortized debt discount, current	0	0
Deferred Costs, Current	575,000	575,000
Unamortized debt discount, noncurrent	0	0
Deferred Costs, Noncurrent	$ 1,703,000	$ 1,811,000
Stockholders' Equity Note [Abstract]
Common stock, shares issued	30,491,207	30,567,725
Common stock, shares outstanding	30,491,207	30,567,725
Treasury stock, shares	0	0
Preferred stock, shares outstanding	0	0
Series Y Preferred Stock, Par or Stated Value Per Share	$ 0.10	$ 0.00
Series Y Preferred Stock, Shares Authorized	350,000	0.00
Series Y Preferred Stock, Shares Issued	0.00	0.00
Series Y Preferred Stock, Shares Outstanding	0.00	0.00
Common stock, par value (per share)	$ 0.10	$ 0.10
Common stock, shares authorized	220,000,000	220,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares authorized	500,000	500,000
Preferred stock, par value (per share)	$ 0.10	$ 0.10