Note 12 - Long-term Incentive Plan - Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Outstanding outstanding (in shares) | shares	244,000
Weighted average exercise price, options outstanding (in dollars per share)	$ 2.66
Weighted average fair value at grant date, options outstanding (in dollars per share)	$ 1.03
Options granted (in shares) | shares	0
Weighted average exercise price, options granted (in dollars per share)	$ 0
Options exercised (in shares) | shares	0
Weighted average exercise price, options exercised (in dollars per share)	$ 0
Weighted average fair value at grant date, options exercised (in dollars per share)	$ 0
Options expired (in shares) | shares	(190,000)
Weighted average exercise price, options expired (in dollars per share)	$ 2.89
Weighted average fair value at grant date, options expired (in dollars per share)	$ 1.20
Options cancelled or forfeited (in shares) | shares	0
Weighted average exercise price, options cancelled or forfeited (in dollars per share)	$ 0
Outstanding outstanding (in shares) | shares	54,000
Weighted average exercise price, options outstanding (in dollars per share)	$ 1.83
Weighted average fair value at grant date, options outstanding (in dollars per share)	$ 0.43
Options Vested (in shares) | shares	54,000
Weighted average exercise price, options vested (in dollars per share)	$ 1.83
Weighted average fair value at grant date, options vested (in dollars per share)	$ 0.43
Options exercisable (in shares) | shares	0
Weighted average exercise price, options exercisable (in dollars per share)	$ 0
Weighted average fair value at grant date, options exercisable (in dollars per share)	$ 0