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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities |  |  |
Net income (loss) | $ (3,736,038) | $ (3,694,907) | $ 4,314,318
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities: |  |  |
Depreciation and amortization | 834,951 | 872,868 | 858,391
Share-based compensation | 672,223 | 387,726 |
Inventories reserve |  | 176,424 |
Provision for doubtful accounts | 24,272 | 92,000 | 116,395
Impairment of assets |  | 456,119 |
(Increase) decrease in assets: |  |  |
Inventories | 811,063 | (897,023) | (1,633,077)
Accounts receivable | (1,861,990) | 1,541,159 | 624,699
Other current assets | (225,606) | 1,375,484 | (373,977)
Income taxes receivable | (188,456) |  |
Other assets |  | (750) |
Increase (decrease) in liabilities: |  |  |
Accounts payable | 485,994 | (1,225,762) | 554,722
Litigation proceeds subject to stipulation |  |  | (7,724,826)
Other accrued liabilities | (205,342) | 119,342 | 11,312
Income taxes payable |  | 2,408 | (114)
Insurance proceeds | 466,293 |  |
Net cash used by operating activities | (2,922,636) | (794,912) | (3,252,157)
Cash flows from investing activities |  |  |
Purchase of property, plant, and equipment | (91,878) | (1,947,172) | (1,465,010)
Changes in restricted cash |  |  | 600,897
Net cash used by investing activities | (91,878) | (1,947,172) | (864,113)
Cash flows from financing activities |  |  |
Repayments of long-term debt | (436,280) | (263,200) | (184,447)
Proceeds from long-term debt |  | 525,017 | 276,495
Proceeds from sale of common stock | 2,350,100 |  |
Proceeds from the exercise of stock options |  | 855,021 | 283,933
Stock registration fees |  |  | (60,101)
Payment of Preferred Stock dividends | (220,450) | (220,755) | (283,543)
Net cash provided by financing activities | 1,693,370 | 896,083 | 32,337
Net decrease in cash and cash equivalents | (1,321,144) | (1,846,001) | (4,083,933)
Cash and cash equivalents at: |  |  |
Beginning of period | 16,199,043 | 18,045,044 | 18,045,044
End of period | 14,877,899 | 16,199,043 | 18,045,044
Supplemental schedule of cash flow information: |  |  |
Interest paid | 210,761 | 213,295 | 219,672
Income taxes paid | 1,031 | 2,000 | 3,700
Supplemental schedule of noncash investing and financing activities: |  |  |
Preferred dividends declared, not paid | $ 55,113 | $ 55,113 | $ 55,414

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