Note 14 - Employee Benefit Plans (Details Textual) - USD ($)		12 Months Ended
	Dec. 31, 1998	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 472,000	$ 362,000
Stock Purchased by Employee Stock Ownership Plan, Shares	61,501
Employee Stock Ownership Plan (ESOP) Loan Payments From ESOP Loan Term	10 years
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares		54,196	54,204
Employee Stock Ownership Plan (ESOP), Compensation Expense		$ 0	$ 0