Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 1,826	$ 3,171
Adjustments to reconcile the net income to cash flows from operating activities:
Depreciation	3,689	3,456
Amortization of deferred grant and other income	(659)	(632)
Gain on sale of equipment	(42)	(498)
Deferred grant and other income		52
Deferred income taxes	378	(61)
Share-based compensation	85	114
Increase (decrease) in cash from:
Accounts receivable	(692)	1,552
Materials and supplies	156	241
Prepaid expenses and other current assets	13	(126)
Accounts payable and accrued expenses	(35)	260
Net cash flows from operating activities	4,719	7,529
Cash flows from Investing Activities:
Purchase of property and equipment	(6,360)	(4,624)
Proceeds from sale of property, equipment and easements	15	1,282
Net cash flows used in investing activities	(6,345)	(3,342)
Cash Flows from Financing Activities:
Proceeds from long-term debt	1,000
Dividends paid	(781)	(782)
Issuance of common shares for stock options exercised and employee stock purchases	76	147
Proceeds from deferred grant income	1,198	248
Net cash flows from (used in) financing activities	1,493	(387)
(Decrease) increase in Cash and Cash Equivalents	(133)	3,800
Cash and Cash Equivalents, Beginning of Period	6,414	2,614
Cash and Cash Equivalents, End of Period	6,281	6,414
Supplemental Disclosures:
Cash paid for income taxes	533	306
Deferred grant income in accounts receivable	110	$ 832
Property and equipment included in accounts payable	$ 257