Note 11 - Retirement Plans - Estimated Cost Amortized From Accumulated Other Comprehensive Income Into Net Periodic Cost (Details) - Supplemental Employee Retirement Plan [Member] $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
USD ($)
| |
| Unrecognized net actuarial loss | $ 5 |
| Total | $ 5 |