Consolidated Statements of Comprehensive Loss (Parentheticals) - Related Party - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commissions related party	$ 437,817	$ 708,153	$ 750,533
Vessels operating expenses related party	1,203,487	1,282,699	797,143
Dry-docking expenses related party	71,057	123,840	109,248
General and administrative expenses related party	3,276,739	5,775,899	7,670,556
Loss related to vessels held for sale related party	775,050	0	0
Vessel sale & purchase commissions related party	87,079	745,000	0
Loss from contract cancellation related party	0	0	444,421
Interest income related party	$ 0	$ 0	$ 504,326

Brokerage commissions on contracted charter revenues charged by a related party.

No definition available.

Name:	prgn_CommissionsRelatedParty
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Administrative services fees, executive services fees and rental expenses charged by related parties.

No definition available.

Name:	prgn_GeneralAndAdministrativeExpenseRelatedParty
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Related party interest income including amendment fee.

No definition available.

Name:	prgn_InvestmentIncomeInterestRelatedPartyIncludingAmendmentFee
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Loss recorded from newbuilding contract cancellation, relating to amounts charged by a related party.

No definition available.

Name:	prgn_LossFromContractCancellationRelatedParty
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for sale, relevant to a related party.

No definition available.

Name:	prgn_LossRelatedToAssetsHeldForSaleRelatedParty
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Vessel sale & purchase commissions charged by the management company.

No definition available.

Name:	prgn_SalePurchaseCommissions
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Superintendent fees charged by the management company, included in dry-docking expenses.

No definition available.

Name:	prgn_SuperintendentFeesDrydockingExpenses
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Superintendent and manning services fees charged by related parties.

No definition available.

Name:	prgn_VesselOperatingExpensesRelatedParty
Namespace Prefix:	prgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_IncomeStatementLocationAxis=prgn_RelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: