Note 13 - Federal and State Income Taxes (Details Textual) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,124,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	223,000	$ 221,000
Domestic Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 5,100,000
State and Local Jurisdiction [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		$ 3,700,000