Note 3 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent	35.40%	39.80%
Increase (Decrease) in Effective Tax Rate from Capital Loss Valuation Allowance Write Off			$ (300,000)
Increase (Decrease) in Effective Tax Rate from Adjustments Related to Federal Tax Examinations	$ (48,000)
Unrecognized Tax Benefits	338,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	7,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	82,000
Unrecognized Tax Benefits that Would Not Impact Effective Tax Rate	$ 257,000