Note 17 - Employee Benefits and Retirement Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Defined Contribution Plan Employer Matching Contribution Percentage of Deferred Salar	100.00%
Defined Contribution Plan Maximum Annual Employee Contribution Percentage of Deferred Salar	3.00%
Defined Contribution Plan Employer Matching Contribution Percentage of Deferred Salary One	50.00%
Defined Contribution Plan Maximum Annual Employee Contribution Percentage of Deferred Salary One	2.00%
Defined Contribution Plan, Cost Recognized	$ 457	$ 396	$ 368
Deferred Compensation Plan Balance Maximum	$ 500			$ 500
Defined Contribution Plan, Employer Discretionary Contribution Amount				0
Director [Member]
Deferred Compensation Arrangement with Individual Compensation Interest Rate	10.00%
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 281	274	254
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 3,800	3,700	3,600	3,800
The 2013 Plan [Member]
Deferred Compensation Period	30 days
Deferred Compensation Arrangement Monthly Installment Period	10 years
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Compensation Expense	$ 551	726	741
Defined Benefit Plan, Benefit Obligation	$ 3,400	$ 3,500	$ 3,300	$ 3,400
The 1993 Plan [Member]
Deferred Compensation Arrangement Monthly Installment Period	15 years
The 1993 Plan [Member] | Director [Member] | Prime Rate [Member]
Defined Benefit Plan Basis Spread on Variable Rate	3.25%
Minimum [Member]
Defined Benefit Plan Designated Payment Period	10 years
Maximum [Member]
Defined Benefit Plan Designated Payment Period	20 years