Note 13 - Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Note 13 - Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Cost Recognized	$ 546,000	$ 480,000	$ 425,000
Annuity Payment, Maximum Contractual Term	10 years
Retirement Age to Be Attained to Receive Postretirement Benefits	65
Defined Benefit Pension Plan, Liabilities	$ 1,300,000	1,400,000
Pension and Other Postretirement Benefit Expense	$ 34,000	36,000	39,000
Deferred Compensation Plan, Benefits, Number of Years to Vest	3 years
Deferred Compensation Plan, Amount Vested	$ 851,000	833,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 15,000	$ 147,000	$ 0
Deferred Compensation Plan, Shares Acquired (in Shares) | shares	0	0	0
Deferred Compensation Plan, Shares Held (in Shares) | shares	25,437
Other Assets [Member]
Note 13 - Benefit Plans (Details) [Line Items]
Cash Surrender Value of Life Insurance	$ 2,300,000	$ 2,200,000
Minimum [Member]
Note 13 - Benefit Plans (Details) [Line Items]
Annual Annuity Payments	15,000
Maximum [Member]
Note 13 - Benefit Plans (Details) [Line Items]
Annual Annuity Payments	$ 25,000