Note 17 - Employee Benefit Plans - (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Employee Compensation and Benefits	$ 690,000	$ 542,000	$ 467,000
Deferred Compensation Arrangement with Individual, Recorded Liability	2,400,000	2,100,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 224,000	$ 209,000
Deferred Compensation Arrangement with Individual, Reversal of Accrued Liabilities			$ 339,000