Note 10 - Union Bargaining Unit Intermittent Employees Severance Plan (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Intermittent Severance Plan [Member] | Minimum [Member]
Defined Benefit Plan Assumptions Discount Rate Analysis Yield Curve of Annualized Individual Rates Period	1 year
Intermittent Severance Plan [Member] | Maximum [Member]
Defined Benefit Plan Assumptions Discount Rate Analysis Yield Curve of Annualized Individual Rates Period	30 years
Intermittent Severance Plan [Member]
Defined Benefit Plan Payment Period for Each Year Worked	8 days
Defined Benefit Plan Eligible Service Period	3 years
Defined Benefit Plan Age to Be Reached to Be Eligible for Payment	60 years
Defined Benefit Plan, Benefit Obligation	$ 409,337	$ 443,079
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	12,000	$ 41,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	94,000
Defined Benefit Plan Estimated Actuarial Gain (Loss)	1,312
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 77,400