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Note 17 - Employment Agreements (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
Officer [Member] |  |  |
Employment Agreement Term (Year) | 5 years |  |
Former CEO [Member] |  |  |
Deferred Compensation Arrangement with Individual, Recorded Liability |  |  | $ 619,000
Deferred Compensation Arrangement with Individual, Death Benefit | $ 0 | $ 0 |
Deferred Compensation Arrangement With Individual Recorded Liability Current | $ 0 | $ 207,000 |

X
- Definition Represents the carrying amount of death benefits accrued. + References No definition available. + Details
Name: | apt_DeferredCompensationArrangementWithIndividualDeathBenefit
Namespace Prefix: | apt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The compensation expense recognized during the current period pertaining to the deferred compensation arrangement. + References No definition available. + Details
Name: | apt_DeferredCompensationArrangementWithIndividualRecordedLiabilityCurrent
Namespace Prefix: | apt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period of the employment agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | apt_EmploymentAgreementTerm
Namespace Prefix: | apt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_OfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=apt_FormerCeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |