XML 154 R33.htm IDEA: XBRL DOCUMENT
v3.19.1

Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of the options granted during 2018 and 2017 and the related assumptions used in the Black-Scholes option model used to value the options granted were as follows:
|  | Employee Stock Option Granted |
|  | October 19, 2017 |  |  | July 27, 2017 |
Weighted-average fair value per share |  | $ | 1.75 |  |  |  | 1.88 |
Risk -free interest rate (1) |  |  | 1.98 | % |  |  | 1.98 | %
Expected volatility of stock (2) |  |  | 54.64 | % |  |  | 53.15 | %
Dividend yield |  |  | None |  |  |  | None |
Expected option life (3) |  |  | 5.0 years |  |  |  | 6.0 years |
|  | Outside Director Stock Options Granted |
|  | January 18, 2018 |  |  | July 26, 2018 |  |  | January 13, 2017 |  |  | July 27, 2017 |
Weighted-average fair value per share |  | $ | 2.55 |  |  |  | 3.02 |  |  | $ | 2.63 |  |  | $ | 2.48 |
Risk -free interest rate (1) |  |  | 2.62 | % |  |  | 2.98 | % |  |  | 2.40 | % |  |  | 2.32 | %
Expected volatility of stock (2) |  |  | 57.29 | % |  |  | 55.34 | % |  |  | 56.32 | % |  |  | 57.21 | %
Dividend yield |  |  | None |  |  |  | None |  |  |  | None |  |  |  | None |
Expected option life (3) |  |  | 10.0 years |  |  |  | 10.0 years |  |  |  | 10.0 years |  |  |  | 10.0 years |
(1) | The risk-free interest rate is based on the U.S. Treasury yield in effect at the grant date over the expected term of the option.
(2) | The expected volatility is based on historical volatility from our traded Common Stock over the expected term of the option.
(3) | The expected option life is based on historical exercises and post-vesting data.
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The following table summarizes stock-based compensation recognized for fiscal years 2018 and 2017.
|  | Year Ended |
|  | 2018 |  |  | 2017 |
Employee Stock Options |  | $ | 147,000 |  |  | $ | 78,000 |
Director Stock Options |  |  | 51,000 |  |  |  | 46,000 |
Total |  | $ | 198,000 |  |  | $ | 124,000 |
Schedule of Stock Options Roll Forward | The summary of the Company’s total plans as of December 31, 2018 and 2017, and changes during the period then ended are presented as follows:
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding January 1, 2018 |  |  | 624,800 |  |  | $ | 4.42 |  |  |  |  |  |  |  |  |
Granted |  |  | 18,000 |  |  |  | 4.22 |  |  |  |  |  |  |  |  |
Exercised |  |  | (10,000 | ) |  |  | 3.65 |  |  |  |  |  |  |  |  |
Forfeited/expired |  |  | (16,800 | ) |  |  | 11.70 |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 616,000 |  |  | $ | 4.23 |  |  |  | 4.7 |  |  | $ | ─ |
Options exercisable at December 31, 2018(1) |  |  | 249,333 |  |  | $ | 5.04 |  |  |  | 4.4 |  |  | $ | ─ |
Options exercisable and expected to be vested at December 31, 2018 |  |  | 616,000 |  |  | $ | 4.23 |  |  |  | 4.7 |  |  | $ | ─ |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding January 1, 2017 |  |  | 247,200 |  |  | $ | 6.69 |  |  |  |  |  |  |  |  |
Granted |  |  | 428,000 |  |  |  | 3.64 |  |  |  |  |  |  |  |  |
Exercised |  |  | ─ |  |  |  | ─ |  |  |  |  |  |  |  |  |
Forfeited/expired |  |  | (50,400 | ) |  |  | 8.95 |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 624,800 |  |  |  | 4.42 |  |  |  | 5.5 |  |  | $ | 19,780 |
Options exercisable at December 31, 2017(1) |  |  | 179,467 |  |  |  | 6.30 |  |  |  | 4.6 |  |  | $ | 13,080 |
Options vested and expected to be vested at December 31, 2017 |  |  | 624,800 |  |  | $ | 4.42 |  |  |  | 5.5 |  |  | $ | 19,780 |
(1) | Options with exercise prices ranging from $2.79 to $13.35
(2) | The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option.
Schedule of Non Vested Options | The summary of the Company’s nonvested options as of December 31, 2018 and changes during the period then ended are presented as follows:
|  |  |  |  | Weighted Average |
|  |  |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |
Non-vested options January 1, 2018 |  |  | 445,333 |  |  | $ | 1.89 |
Granted |  |  | 18,000 |  |  |  | 1.89 |
Vested |  |  | (96,666 | ) |  |  | 1.99 |
Forfeited |  |  | ─ |  |  |  | ─ |
Non-vested options at December 31, 2018 |  |  | 366,667 |  |  | $ | 1.91 |

X
- Definition Schedule of Non Vested Options [Table Text Block] + References No definition available. + Details
Name: | PESI_ScheduleOfNonVestedOptionsTableTextBlock
Namespace Prefix: | PESI_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
Name: | us-gaap_ScheduleOfStockOptionsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration