Note 7 - Stock-based Awards - Nonvested Award Activity (Details) - Stock Unit Award [Member] - $ / shares					12 Months Ended
		May 13, 2021	Mar. 16, 2021	Jan. 25, 2021	Dec. 31, 2021
Outstanding & Unvested at beginning of period (in shares)					166,000
Outstanding & Unvested at beginning of period, weighted average price per share (in dollars per share)	[1]				$ 4.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		115,500	2,000,000	1,500	119,000
Granted, weighted average price per share (in dollars per share)	[1]				$ 6.55
Converted to common stock (in shares)					(52,000)
Converted to common stock, weighted average price per share (in dollars per share)	[1]				$ 4.89
Cancelled (in shares)					(9,000)
Cancelled, weighted average price per share (in dollars per share)	[1]				$ 4.94
Outstanding & Unvested at end of period (in shares)					224,000
Outstanding & Unvested at end of period, weighted average price per share (in dollars per share)	[1]				$ 5.48

[1] Weighted average price per share is the weighted grant price based on the closing market price of each of the stock grants related to each transaction type. The weighted average fair value is the weighted average share price times the number of shares.