Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Net income	$ 391	$ 401
Adjustments to reconcile the net income to cash flows from operating activities:
Depreciation	2,648	2,682
Gain on sale of equipment		(538)
Amortization of deferred grant and other income	(612)	(724)
Proceeds from deferred grant and other income	353	701
Provision for deferred income taxes	228	293
Share-based compensation	96	114
Increase (decrease) in cash from:
Accounts receivable	(157)	(1,106)
Materials and supplies	(318)	289
Prepaid expenses and other current assets	(304)	(347)
Accounts payable and accrued expenses	841	553
Net cash flows from operating activities	3,166	2,318
Cash flows from Investing Activities:
Purchase of property and equipment	(4,589)	(3,246)
Proceeds from sale of property, equipment and easements		952
Net cash flows used in investing activities	(4,589)	(2,294)
Cash Flows from Financing Activities:
Dividends paid	(587)	(586)
Issuance of common shares for stock options exercised and employee stock purchases	48	110
Net cash flows used in financing activities	(539)	(476)
Decrease in Cash and Cash Equivalents	(1,962)	(452)
Cash and Cash Equivalents, Beginning of Period	6,414	2,614
Cash and Cash Equivalents, End of Period	4,452	2,162
Supplemental Disclosures:
Cash paid for income taxes	508	139
Property and equipment included in accounts payable	$ 184	$ 304