Note 5 - Retirement Plans - Schedule of Change in Projected Benefit Obligation of Pension Plan and Change in Assets at Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015
PBO, beginning of year	$ 990,700
Service cost	100,000
Interest cost	49,500
Actuarial (gain) loss	(24,700)
Settlements	(1,115,500)
PBO, end of year
Fair value, beginning of year	640,600
Actual return on plan assets	(800)
Company contributions	475,700
Benefits paid	(1,115,500)
Fair value, end of year	640,600
Funded status at December 31, 2015