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Schedule II - Valuation and Qualifying Accounts: (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Valuation and Qualifying Accounts [Table Text Block] |
|  | 201 7 |  |  | 201 6 |
Balance at beginning of year |  | $ | 137,000 |  |  | $ | 126,000 |
Charged to expenses |  |  | 6,000 |  |  |  | 26,000 |
Uncollectible accounts written off |  |  | (29,000 | ) |  |  | (15,000 | )
Balance at end of year |  | $ | 114,000 |  |  | $ | 137,000 |
|  | 201 7 |  |  | 2016 |
Balance at beginning of year |  | $ | 794,000 |  |  | $ | 823,000 |
Charged to expenses |  |  | - |  |  |  | (11,000 | )
Excess inventory written off |  |  | (294,000 | ) |  |  | (18,000 | )
Balance at end of year |  | $ | 500,000 |  |  | $ | 794,000 |
Deferred Tax Asset Valuation Allowance |  | 2017 |  | 2016
Beginning Balance | $ | 45,000 | $ | 45,000
Additions charged (credited) to expense |  | 586,706 |  | -
Balance at end of year | $ | 631,706 | $ | 45,000
Schedule of Property and Equipment and the Related Depreciation [Table Text Block] |
|  | 201 7 |  |  | 201 6 |
Cost Basis |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 38,250,000 |  |  | $ | 39,025,000 |
Additions |  |  | 813,697 |  |  |  | - |
Disposals |  |  | (7,620,697 | ) |  |  | (775,000 | )
Balance at end of year |  | $ | 31,443,000 |  |  | $ | 38,250,000 |
Accumulated depreciation |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 32,938,000 |  |  | $ | 32,472,000 |
Depreciation |  |  | 1,568,697 |  |  |  | 466,000 |
Disposals |  |  | (7,620,697 | ) |  |  | - |
Balance at end of year |  | $ | 26,886,000 |  |  | $ | 32,938,000 |

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