Note 12 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Right-of-Use Asset	$ 3,535,000
Operating Lease, Liability, Total	3,586,000	$ 3,586,000
Finance Lease, Liability, Total	0
Operating Lease, Expense	$ 1,154,000	$ 1,109,000
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years
Operating Lease, Weighted Average Discount Rate, Percent	4.17%