Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net income	$ 3,171us-gaap_NetIncomeLoss	$ 1,421us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation	3,456us-gaap_Depreciation	3,537us-gaap_Depreciation
Provision for allowance for doubtful accounts		45us-gaap_ProvisionForDoubtfulAccounts
Amortization of deferred grant and other income	(632)pwx_AmortizationOfDeferredGrantsIncome	(553)pwx_AmortizationOfDeferredGrantsIncome
Gains from sale of equipment	(498)us-gaap_GainLossOnDispositionOfAssets	(72)us-gaap_GainLossOnDispositionOfAssets
Deferred grant and other revenue	52pwx_DeferredGrantIncomeAndOther	2,514pwx_DeferredGrantIncomeAndOther
Deferred income taxes	(61)us-gaap_DeferredIncomeTaxExpenseBenefit	219us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation	114us-gaap_ShareBasedCompensation	92us-gaap_ShareBasedCompensation
Increase (decrease) in cash from:
Accounts receivable	1,552	(1,311)
Materials and supplies	241us-gaap_IncreaseDecreaseInInventories	(329)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(126)	(63)
Accounts payable and accrued expenses	260	(203)
Net cash flows from operating activities	7,529	5,297
Cash Flows from Investing Activities:
Purchase of property and equipment	(4,624)	(3,421)
Proceeds from sale of property, equipment and easements	1,282	123
Net cash flows used in investing activities	(3,342)	(3,298)
Cash Flows from Financing Activities:
Dividends paid	(782)us-gaap_PaymentsOfOrdinaryDividends	(778)us-gaap_PaymentsOfOrdinaryDividends
Issuance of common shares for stock options exercised and employee stock purchases	147	103
Proceeds from deferred grant income	248pwx_ProceedsFromDeferredGrantIncome	339pwx_ProceedsFromDeferredGrantIncome
Net cash flows used in financing activities	(387)	(336)
Increase in Cash and Cash Equivalents	3,800	1,663
Cash and Cash Equivalents, Beginning of Year	2,614	951
Cash and Cash Equivalents, End of Year	6,414	2,614
Supplemental Disclosures:
Deferred grant income in accounts receivable	832us-gaap_RecognitionOfDeferredRevenue
Cash paid during year for income taxes, net	306us-gaap_IncomeTaxesPaidNet	705us-gaap_IncomeTaxesPaidNet
Capital expenditures financed through accounts payables		$ 117

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

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