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Shareholders' Equity - Option Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Plan Shares Available for Grant |  |
Balance at the beginning of the period (in shares) | 307,767 | 95,968
Shares reserved | 200,000 | 650,000
Balance at the end of the period (in shares) | 477,534 | 307,767
Stock Options |  |
Plan Shares Available for Grant |  |
Stock options granted (in shares) | (200,000) | (426,000)
Plan Options Outstanding |  |
Balance at the beginning of the period (in shares) | 1,255,077 | 1,251,442
Stock options granted (in shares) | 200,000 | 426,000
Stock options exercised (in shares) | (113,837) | (155,407)
Balance at the end of the period (in shares) | 895,161 | 1,255,077
Weighted Average Exercise Price Per Share |  |
Balance at the beginning of the period (in dollars per share) | $ 2.86 | $ 2.72
Stock options granted (in dollars per share) | 2.82 | 3.02
Stock options exercised (in dollars per share) | 1.90 | 1.94
Balance at the end of the period (in dollars per share) | $ 2.73 | $ 2.86
Aggregate Intrinsic Value, Stock options exercised (in dollars) | $ 105,012 | $ 217,694
Restricted stock units |  |
Plan Shares Available for Grant |  |
Restricted stock units granted (in shares) | (99,000) | (25,000)
2013 Plan | Board of Directors |  |
Plan Shares Available for Grant |  |
Stock awards granted (in shares) | (37,233) | (29,701)
2013 Plan | Stock Options |  |
Plan Shares Available for Grant |  |
Cancelled or forfeited (in shares) | 279,000 | 42,500
Plan Options Outstanding |  |
Cancelled or forfeited (in shares) | (279,000) | (42,500)
Weighted Average Exercise Price Per Share |  |
Cancelled (in dollars per share) | $ 2.87 | $ 3.03
2013 Plan | Restricted stock units |  |
Plan Shares Available for Grant |  |
Restricted stock units granted (in shares) | (99,000) | (25,000)
Cancelled or forfeited (in shares) | 27,000 |
Weighted Average Exercise Price Per Share |  |
Cancelled, restricted stock units (in dollars per share) | $ 2.89 |
2003 Plan | Stock Options |  |
Plan Options Outstanding |  |
Cancelled or forfeited (in shares) | (167,079) | (224,458)
Weighted Average Exercise Price Per Share |  |
Cancelled (in dollars per share) | $ 4.13 | $ 2.95

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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