Long-Term Debt And Credit Facilities (Revolving Line Of Credit) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016 USD ($)	May. 10, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Cash and cash equivalents	$ 1,602,951		$ 5,593,582	$ 4,438,533	$ 7,270,301
Total liquidity	6,500,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000,000
Line of credit maturity date	Mar. 31, 2018
Line of credit facility, amount outstanding	$ 0
Line of credit facility, current borrowing capacity	$ 4,900,000
Subsequent Event [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Minimum tangible net worth requirement, period one		$ (24,000,000)
Minimum tangible net worth requirement, period two		$ (24,500,000)
Subsequent Event [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Liquidity ratio		1.50