Note 18 - Transactions With Affiliates and Related Parties (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction, Amounts of Transaction	$ 1,400,000	$ 685,000	$ 653,000
Glassboro Properties, LLC. [Member]
Related Party Transaction, Amounts of Transaction	158,000	165,000	172,000
Purchase of Marketing and Graphic Design Services [Member] | InterArch [Member]
Related Party Transaction, Amounts of Transaction	$ 1,100,000	400,000	361,000
Vernon W Hill [Member]
Major Shareholder Ownership Percentage	8.20%
Public Relations Services [Member] | Brian Communications [Member]
Related Party Transaction, Amounts of Transaction	$ 120,000	$ 120,000	$ 120,000