Note 10 - Cyber-Attack (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Insurance Settlements Receivable	$ 2,771,000
Cyber Attack [Member]
Insurance Settlements Receivable	2,800,000
Revenue Adjustment	(280,000)
Cyber Attack Expense	285,000
Cyber Attack [Member] | Insurance Settlements Recoveries Due in Thirty Days [Member]
Insurance Settlements Receivable	2,400,000
Cyber Attack [Member] | Insurance Settlements Recoveries Paid Directly by Insurer to Vendors [Member]
Insurance Settlements Receivable	$ 400,000