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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income/(loss) |  | $ 5,261,411 | $ (149,124)
Adjustments to reconcile net income/(loss) to net cash used in operating activities |  |  |
Stock-based compensation |  | 932,743 | 775,757
Depreciation and amortization | [1] | 867,277 | 813,657
Deferred income tax benefit |  | 831,148 | (435,495)
Deferred revenue |  | (80,187) |
Provision for doubtful accounts |  | 1,413 | (16,395)
Increase/(decrease) in operating assets |  |  |
Accounts receivable |  | (1,452,507) | 2,500,124
Cost in excess of billings on contracts in progress |  | (5,800,506) | 2,038,500
Inventories, net |  | 345,916 | (290,109)
Other current assets |  | 68,112 | (68,473)
Increase/(decrease) in operating liabilities |  |  |
Accounts payable |  | 431,836 | 435,129
Accrued expenses |  | 795,552 | (1,503,062)
Current maturities of long-term debt |  |  | (280,000)
Billings in excess of costs and estimated earnings on contracts in progress |  | (4,796,025) | 5,262,339
Deferred revenue |  | 214,320 | (230,050)
Total adjustments |  | (7,640,908) | 9,001,922
Net cash (used in)/provided by operating activities |  | (2,379,497) | 8,852,798
Cash flows from investing activities: |  |  |
Restricted cash |  |  | 200,000
Capital expenditures |  | (889,298) | (112,493)
Purchase of building |  | (14,000,886) |
Purchase of Mesoscribe Technologies |  | (419,813) | (500,000)
Purchase of assets Tantaline A/S |  | (419,813) | (500,000)
Deposits |  | (10,503) | 1,550
Net cash (used in) investing activities |  | (15,320,500) | (410,943)
Cash flows from financing activities |  |  |
Net proceeds from stock options exercised |  | 146,220 | 462,000
Proceeds from mortgage payable |  | 10,387,500 |
Payments of long-term debt |  | (300,000) | (300,000)
Net cash provided by financing activities |  | 10,233,720 | 162,000
Net (decrease)/increase in cash and cash equivalents |  | (7,466,277) | 8,603,855
Cash and cash equivalents at beginning of year |  | 21,677,186 | 13,073,331
Cash and cash equivalents at end of year |  | 14,210,909 | 21,677,186
Supplemental disclosure of cash flow information: |  |  |
Income taxes paid |  | 601,800 | 101,352
Interest paid |  | $ 71,263 | $ 79,861
[1] | Includes amortization expense of $45,645 and $31,356 for the years ending December 31, 2017 and 2016, respectively. Such amortization expense relates to other capitalized and intangible assets.

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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