Note 15 - Commitments and Contingent Liabilities (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Loss Contingency Accrual, Ending Balance	$ 350,000	$ 350,000
Standby Letters of Credit [Member] | Minimum [Member]
Guarantee Obligations, Agreement Term	1 year
Standby Letters of Credit [Member] | Maximum [Member]
Guarantee Obligations, Agreement Term	2 years