XML 85 R40.htm IDEA: XBRL DOCUMENT
v3.20.1

Note 2 - Summary of Significant Accounting Policies - Fair Value of Financial Assets (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |  |
Investment | $ 335,000 | $ 258,000 | [1]
Marketable Securities [Member] |  |  |
Assets: |  |  |
Investment | 335,000 | 258,000 |
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets: |  |  |
Investment | 335,000 | 258,000 |
Marketable Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets: |  |  |
Investment |  |  |
Marketable Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets: |  |  |
Investment |  |  |
[1] | The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.

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

X
- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=apt_MarketableSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |