Consolidated Balance Sheets (Parentheticals) - USD ($)
|
Dec. 31, 2016 |
Dec. 31, 2015 |
| Property, plant, and equipment, accumulated depreciation |
$ 29,666,000
|
$ 27,970,000
|
| Leased property under capital lease, accumulated depreciation |
4,544,000
|
1,700,000
|
| Accumulated amortization |
$ 1,032,000
|
$ 469,000
|
| Common Stock, par value (in dollars per share) |
$ 0.01
|
$ 0.01
|
| Common Stock, shares authorized |
450,000,000
|
450,000,000
|
| Common Stock, shares issued |
191,723,974
|
180,567,444
|
| Common stock in treasury, shares |
582,328
|
479,953
|
| Series C Redeemable Convertible Preferred Stock |
|
|
| Redeemable convertible Preferred Stock, par value (in dollars per share) |
$ 0.01
|
$ 0.01
|
| Redeemable convertible Preferred Stock, shares authorized |
10,431
|
10,431
|
| Redeemable convertible Preferred Stock, shares issued |
5,231
|
5,231
|
| Redeemable convertible Preferred Stock, shares outstanding |
5,231
|
5,231
|
| Redeemable convertible Preferred Stock, aggregate involuntary liquidation preference (in dollars) |
$ 16,664
|
$ 16,664
|
| Series D Redeemable Convertible Preferred Stock |
|
|
| Redeemable convertible Preferred Stock, par value (in dollars per share) |
$ 0.01
|
$ 0.01
|
| Redeemable convertible Preferred Stock, shares authorized |
5,000,000
|
5,000,000
|
| Redeemable convertible Preferred Stock, shares issued |
18,500
|
0
|
| Redeemable convertible Preferred Stock, shares outstanding |
18,500
|
|
| Redeemable convertible Preferred Stock, aggregate involuntary liquidation preference (in dollars) |
$ 18,500,000
|
$ 18,500,000
|