Note 13 - Employee Benefit Plans (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		12.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 40,000	$ 36,000
Bonus Percentage		5.00%
Accrued Bonuses, Current	$ 1,333,000	$ 1,073,000	1,333,000
President [Member]
Bonus Percentage	5.00%
Bonus, Maximum Threshold		1,000,000
Accrued Bonuses, Current	$ 118,000	$ 233,000	$ 118,000
For Employees Contributing 1 Percent of Gross Earnings [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		0.50%
For Employees Contributing 2 to12 Percent of Gross Earnings [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		1.00%

The maximum threshold for bonus payments under certain bonus plans.

No definition available.

Name:	apt_BonusMaximumThreshold
Namespace Prefix:	apt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The bonus paid to the CEO and President in percentage of the Company's pre-tax profits.

+ References

No definition available.

+ Details

Name:	apt_BonusPercentage
Namespace Prefix:	apt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765

+ Details

Name:	us-gaap_AccruedBonusesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_PresidentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=apt_ForEmployeesContributing1PercentOfGrossEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=apt_ForEmployeesContributing2To12PercentOfGrossEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: