Note 17 - Contingent Liabilities and Commitments (Details Textual)	1 Months Ended						12 Months Ended
	Jan. 31, 2018 USD ($) ft²	Dec. 31, 2017 USD ($)	Apr. 30, 2017 USD ($) ft²	Jun. 30, 2014 USD ($) ft²	Apr. 30, 2012 USD ($)	Jul. 31, 2011 ft²	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Payments for Rent							$ 502,716	$ 575,516
Contractual Obligation		$ 665,373					$ 665,373	$ 1,115,193
Standby Letters of Credit [Member]
Contractual Obligation Reduction Nineteen Months from Initial Term					$ 50,000
Contractual Obligation Remaining					100,000
Contractual Obligation Reduction Thirty One Months from Initial Term					50,000
Contractual Obligation Reduction Forty Three Months from Initial Term					50,000
Lawrenceville New Jersey [Member]
Area of Real Estate Property | ft²			7,565	11,500		10,870
Lessee, Operating Lease, Term of Contract						5 years 180 days
Number of Months in Which Free Rent Is Provided			120 days			180 days
Payments for Rent					23,000
Lessee, Finance Lease, Term of Contract			5 years 120 days
Operating Leases, Monthly Rent Payment in First Year			$ 18,900
Operating Leases, Monthly Rent Payment in Final Year			$ 20,500
Lawrenceville New Jersey [Member] | Standby Letters of Credit [Member]
Contractual Obligation					$ 250,000
Premises Located in Huntsville Alabama [Member]
Lessee, Finance Lease, Term of Contract		30 days
Operating Leases, Monthly Rent Payment				$ 23,200
Premises Located in Huntsville Alabama [Member] | Subsequent Event [Member]
Area of Real Estate Property | ft²	9,049
Lessee, Finance Lease, Term of Contract	5 years
Operating Leases, Monthly Rent Payment	$ 18,100