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Stock options and restricted stock (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 08, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated share-based compensation expense |  | $ 615,739 | $ 192,201 |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) |  |  | 117,879 |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercised (in shares) |  | 0 | 0 |
Performance Shares | 2016 Performance Stock Awards Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  |  | 3 years
Equity instruments other options, grants in period (in shares) | 46,477 |  |  |
Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ 8.05 |  |  |
Performance Shares | 2016 Performance Stock Awards Plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of target award |  |  |  | 0.00%
Performance Shares | 2016 Performance Stock Awards Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of target award |  |  |  | 150.00%
Stock Awards | 2015 Stock Awards Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Equity instruments other options, grants in period (in shares) | 44,949 |  |  |
Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ 15.72 |  |  |
Period after option grant before options can be exercised (in years) | 1 year |  |  |
Stock Awards | 2015 Stock Awards Plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Annual vesting rate (percent) | 20.00% |  |  |
Stock Awards | 2015 Stock Awards Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Annual vesting rate (percent) | 33.00% |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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