Note 9 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 859,000
Operating Lease, Payments	291,000
Operating Lease, Cost	410,000
Operating Lease, Interest Expense	204,000
Operating Lease, Right-of-Use Asset, Amortization	108,000
Variable Lease, Cost	72,000
Short-term Lease, Cost	$ 26,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		$ 966,000